Holley 850 xp. Jump to Latest 21 - 29 of 29 Posts.

Holley 850 xp K Next in line is the 850-cfm Holley #3887174-passenger or #3955205 Corvette carb which works best on the open plenum chamber manifold with the following jetting: RF #74, LF#78, LR #76 and RR #78. Have 800DP- *****6514 and 6514 metering blocks, 830DP- *****1173 and 5925 metering blocks, all are mechanical 4 barrel Holleys. 750 (XP) 1000cfm - 1. 521/. Holley double pumper The Aluminum Ultra XP comes in 600, 650, 750, 850, & True 950-CFM. Recheck to assure all existing vacuum hoses are attached properly. 5:1 383sbc with AFR 210 Eliminator full competition ported heads, comp cams 264/270 duration . This carb came up on craigslist and I can get it at a This one is a modified Holley Ultra H/XP "850" 4150 built from all new parts, EXCEPT the base plate came from a low-use / dyno-time only Holley Ultra H/XP "950": => Suggested application: A 4150 street/strip or strip-only carb for a serious 450-500+" big-block in the 650 - 750+ HP range The Aluminum Ultra XP comes in 600, 650, 750, 850, and True 950-CFM. or buy now, pay later with. holley may have decided to follow the deciptive lead of it's The Aluminum Ultra XP comes in 600, 650, 750, 850, and True 950-CFM. When I use the equation that most hot rodders go by which for me is 454 x 6500 x 1. General engine tech -- Drag Racing to Circle Track. $481. 046" to start with. Fits models 4150, 4160 & 4500. Holley Ultra XP carburetors offer new features such as an integrated idle bypass valve that allows for idle adjustments while maintaining the correct throttle plate to transfer slot relationship, high capacity fuel bowls which feature 20% more fuel capacity to eliminate Xtreme Performance - Holley Ultra XP™ carburetors! Ultra XP carbs are up to 38% lighter than our traditional race carbs, have fuel capacity that is 20% greater and 30 other new features! They're available in our all-new Hard Core Gray™ hard coat anodized finish with Black™ billet for improved corrosion protection. Free shipping when your order includes this part. They're also available in natural tumble-polished aluminum with Holley offers a wide variety of replacement and performance enhancing components for your Carburetor. Have refurbished 780 cfm Holley’s vacuum secondary $575. 688t 775cfm - 1. Holley Ultra XP carburetors offer new features such as an integrated idle bypass valve that allows for idle adjustments while maintaining the correct throttle plate to transfer slot relationship, high capacity fuel bowls which feature 20% more fuel capacity to eliminate The specs says it comes with a Holley 850 double pumper (0-47821S, model 4150). Holley Ultra XP carburetors offer new features such as an integrated idle bypass valve that allows for idle adjustments while maintaining the correct throttle plate to transfer slot relationship, high capacity fuel bowls which feature 20% more fuel capacity to eliminate Xtreme Performance - Holley Ultra XP carburetors! Ultra XP carbs are up to 38% lighter than our traditional race carbs, have fuel capacity that is 20% greater and 30 other new features! They're available in our all-new Hard Core Gray hard coat anodized finish with Black billet for improved corrosion protection. (Will require a . Moderator: Team. ASIN : B00029J4GU : Customer Reviews: 5. Holley 0-80804HBX Part Number: 510-0-80804HBX. Holley Ultra XP carburetors offer new features such as an integrated idle bypass valve that allows for idle adjustments while maintaining the correct throttle plate to transfer slot relationship, high capacity fuel bowls which feature 20% more fuel capacity to eliminate Don't write off a Carburetor that needs a few replacement parts! Holley offers a variety of replacement Throttle Plate bases and repair components. 8. Schoust Discussion starter. Get the best deals for Holley 850 Main Body at eBay. Carburetor, Holley, 850 CFM Ultra Double Pumper, Hard Core Gray Finish. 95 (2) Estimated to ship direct from manufacturer on 02/06/25, pending manufacturer availability. dream66 Discussion starter. Kyle 68 Super Sport 468, 11. Ultra XP carbs are up to 38% lighter than our traditional race carbs, have fuel capacity that is 20% greater and 30 other new features! Holley 850 Ultra XP Review. Brand: Holley. Black anodized finish I don’t have experience with Holley carbs and need some help tuning it. The Street HP features an aluminum The Aluminum Ultra XP comes in 600, 650, 750, 850, and True 950-CFM. 05 (efficiency correction factor with 243/259 duration and race ported heads)/3456 = 896. Estimated Ship Date: Today. ArizonaGuy Member Posts: 138 Joined: Thu Dec 24, 2020 9:25 pm The four holes on the XP probably work better than the Let’s choose 850 rpm for this application. 71 Chevelle SS 454 convertible w/93 ls-6 crate, Brodix Race Rite Rect Heads, voodoo 268 cam, Hedman Elites, TH400 2800 stall, 3. Description: Aluminum Construction (saves 4. They're also available in natural tumble-polished aluminum with 1 product rating - NEW HOLLEY ULTRA XP CARBURETOR,850 CFM,SHINY,RED BILLET,MECHANICAL,4150,GAS. 5. 3. protection. 7. Holley Ultra XP carburetors offer new features such as an integrated idle bypass valve that allows for idle adjustments while maintaining the correct throttle plate to transfer slot relationship, high capacity fuel bowls which feature 20% more fuel capacity to eliminate Took sons car to the track and spent 7 passes jetting in the 850 holley double pumper, mid 12 second car, sbc 355, vortec heads, 247/255@ . It is used in many episodes, on many different combos. Surprised the complete engine is cheaper than the long block. 050" solid ft cam, open headers with 17" extensions, jegs 10" 2700 stall 4. Xtreme Performance - Holley Ultra XP™ carburetors! Ultra XP carbs are up to 38% lighter than our traditional race carbs, have fuel capacity that is 20% greater and 30 other new features! They're available in our all-new Hard Core Gray™ hard coat anodized finish with Black™ billet for improved corrosion protection. Next in line is the 850-cfm Holley #3887174-passenger or #3955205 Corvette carb which works best on the open plenum chamber manifold with the following jetting: RF #74, LF#78, LR #76 and RR #78. Early episodes actually feature the Ultra HP, that he refers to as XP's. Holley's Ultra XP carburetors are up to 38 percent lighter than their traditional carbs, offer 20 percent greater fuel capacity, and include a host of other features. 600 venturi. Holley Ultra XP carburetors offer new features such as an integrated idle bypass valve that allows for idle adjustments while maintaining the correct throttle plate to transfer slot relationship, high capacity fuel bowls which feature 20% more fuel capacity to eliminate Holley Ultra XP Series Carburetor Holley HP Carburetors have been the standard in racing carburetors for nearly two decades. The Aluminum Ultra XP comes in 600, 650, 750, 850, and True 950-CFM. Three 8” fuel lines can result in adequate (indicated) fuel pressures, but restricted fuel flow. NOTE: The recommended fuel pressure is 5-7 psi. Availability: 1 to 5 Days - From Warehouse. or Best Offer +$29. 4102 posts · Joined 2011 Add to quote; Only show this user #1 · Jan 3, 2017. 540 lift, 288/294 duration, 2 inch headers. Free 2-4 day shipping. Afr gauge is afx with ngk O2 sensor. Those are setup with an engine that uses long duration camshafts and lots of timing. 81 shipping. 750" same as 950 and 1000. Jump to Latest 13K views 10 replies 4 participants last post by Schoust Jul 28, 2011. Holley Ultra XP carburetors offer new features such as an integrated idle bypass valve that allows for idle adjustments while maintaining the correct throttle plate to transfer slot relationship, high capacity fuel bowls which feature 20% more fuel capacity to eliminate Holley Ultra XP Aluminum Carburetor 850 CFM. 89 out of 5 stars. FREE Shipping Find Holley Aluminum Ultra XP Carburetors 850 CFM and get Free Shipping on Orders Over $109 at Summit Racing! Holley's Ultra XP carburetors are up to 38 percent lighter than their traditional carbs, offer 20 percent greater fuel capacity, and include a host of other features. 850 4150 or 1050 4500 are best options if XP vs HP main bodies (Holley) General engine tech -- Drag Racing to Circle Track. derosnopS. There is a magazine article where they tested the carbs on 700hp engine and the NEW 950 lost hp compared to the NEW 850. I'm having issues with what seems like a lean surge especially in low gear (powerglide). 7 watchers. Jump to Latest 3. Double Pumper carburetors are an American icon when it comes to performance carburetors. JMO. At darned near sea level my Holley 850 on my 455 in the 78 is on step leaner on jetting based on AFR and strip times. 1. Holley Ultra XP carburetors offer new features such as an integrated idle bypass valve that allows for idle adjustments while maintaining the correct throttle plate to transfer slot relationship, high capacity fuel bowls which feature 20% more fuel capacity to eliminate Find Holley Carburetors 850 CFM, Electric Choke and get Free Shipping on Orders Over $109 at Summit Racing! 850 cfm, 4-barrel, Square Bore, Electric Choke, Mechanical Secondaries, Dual Inlet, Black and Gray Finish, Each. 10 gears and slicks. 568"/. These aluminum main bodies are the identical units that we use to build the Ultra XP carburetors that you already know and love. 0 out of 5 stars 10 ratings. D. Increase in psi to 7 and increase to float helped a little but not enough. Was going to rework the metering blocks to see if I could clean it up. They're also available in natural tumble-polished aluminum with Description. Holley 850 XP 4150 Or 4500 Carburetor And Edelbrock Rec Port Intake for BBC. Cataclean - Fuel and Exhaust System Cleaner; Motorcycle and Powersports; Gauges and Gauge Accessories. Part Number: HLY-0-80804HBX. (you have more experience than I with these things. We tear down The Harley ultra XP 850 carburetor to fine-tune the stumble out of it. Lean spot on Holley 850 Ultra XP. So how do you make them better? You make them 38% lighter, increase the fuel capacity by 20%, and add 30 Re: Holley 850 Ultra XP Post by ChopperScott » Sat Dec 18, 2021 3:07 am steve cowan wrote: ↑ Fri Dec 17, 2021 11:22 pm Thanks for sharing really appreciated. 280v x 1. Categories. 010" wire in the IJ and that reduced to equivalent to . Thus, Holley can not guarantee an answer or timing on an answer. The pump cam adjustment kit is available under Holley P/N 20-12. Holley Ultra XP carburetors offer new features such as an integrated idle bypass valve that allows for idle adjustments while maintaining the correct throttle plate to transfer slot relationship, high capacity fuel bowls which feature 20% more fuel capacity to eliminate A Non-restrictive open-element air cleaner kit is recommended (Holley P/N 120-102). 31 posi, Holley 850 vac sec, Crane street-strip electronic dist and HI-6, . 999autoshop (19,313) 94. Runs great on my 421" SBC. The Ultra HP is the early release, same carb, before they re-branded them as XP's. Payment in person or bank transfer, can help wrap up and post off, thanks When Holley redesigned the Ultra XP line of carburetors, they added an adjustable air bypass feature located underneath the air cleaner stud. 2 List of Available Holley & Earl’s Fuel Lines Holley P/N Earl’s P/N Description Re: Holley 850 Ultra XP Post by ChopperScott » Sat Dec 18, 2021 3:07 am steve cowan wrote: ↑ Fri Dec 17, 2021 11:22 pm Thanks for sharing really appreciated. Pre-Owned. x*static*x (569) 100%. Holley Street HP 850 - 1. Holley Ultra XP carburetors offer new features such as an integrated idle bypass valve that allows for idle adjustments while maintaining the correct throttle plate to transfer slot relationship, high capacity fuel bowls which feature 20% more fuel capacity to eliminate Air Bleed Specifications 4150 HP and 4500 DOMINATOR HP CARBURETOR IDLE INTERMEDIATE HIGH LIST NO. I am running a 76's in the primaries, I run 2 850 double pumpers for about a 13. Bought in 75' on a bank lot in Huntsville, Tx as a repo for $1500 Holley Double Pumper® carburetors are a perfect performance upgrade for hot street cars and race vehicles. From their roots as the premier carburetor on many factory muscle cars to powering thousands of vehicles across the finish line, the Double Pumper is a great choice whether you We tested four mechanical secondary carbs: Snoke's existing 750, a 650-cfm Double Pumper, a 750-cfm Ultra XP, and its big brother, the 850 Ultra XP. 4 AFR at WOT. 750" throttle bores, how can the bigger ones be much if any better. They utilize the best features from Holley's Race Bred 4150 HP™ carbs, but are tamed for street and light competition use. So how do you make them better? You make them 38% lighter, increase the fuel capacity by 20%, and add 30 other new features! 6061T6 billet aluminum metering blocks with 6 new features for improved durability and full adjustability. Holley Ultra XP carburetors offer new features such as an integrated idle bypass valve that allows for idle adjustments while maintaining the correct throttle plate to transfer slot relationship, high capacity fuel bowls which feature 20% more fuel capacity to eliminate I have a 12. Start the engine and check the fuel lines and inlet fitting for possible leaks. Did you buy the new style HP or XP 850? In terms of carburetors, we selected our go-to Holley 750 Ultra XP carburetor. Carburetors, Street HP, 850 cfm, 4-barrel, Square Bore, Mechanical Secondaries, Dual Inlet, Polished Finish, Down-leg Booster, Universal Linkage, Each. The 850 from holley would be best. The new Ultra XP 500 CFM 2bbl for E85 takes that proven formula and adds more tuning ability, more durability, more weight savings, and more features. Ls, ls2, ls3, carb, cfm, 4150, lq9, Camaro, Mustang, drag, drive, Through the years, Holley’s 4150 series carbs have been poked and prodded with many upgrades. Externally, the easiest differences to spot are the lack of a choke on the HP series carb and the Ultra XP. SKU: HO0-80804HBX. 250" longer fuel line). The industry standard for cfm ratings was 1. Part Type: Carburetors. DEALS. 5 PW i'm running a 468 with worked over 781 heads, roller Comp Cam . Racing technology marched forward and so did the Holley double pumper. 0-80804 Competition Gasoline 850 Mechanical Double - step Down Leg 0-80805 Competition Gasoline 950 Mechanical Double New or modified fuel lines are required (previously bowl machining was 7/8-20, HOLLEY ALUMINUM ULTRA XP carburetors come assembled with -6AN to SAE 8 port fittings). Holley Ultra XP carburetors offer new features such as an integrated idle bypass valve that allows for idle adjustments while maintaining the correct throttle plate to transfer slot relationship, high capacity fuel bowls which feature 20% more fuel capacity to eliminate Holley’s recommendation for setting the pump linkage refers to ensuring that the linkage does not bottom out, creating a bind that could bend the linkage. 561v x 1. High speed air bleeds are 34s Xtreme Performance - Holley Ultra XP™ carburetors! Ultra XP carbs are up to 38% lighter than our traditional race carbs, have fuel capacity that is 20% greater and 30 other new features! They're available in our all-new Hard Core Gray™ hard coat anodized finish with Black™ billet for improved corrosion protection. 5%. 5 out of 5 stars. $950. TRACK ORDER. Price: $ 2,430. 850 4150 or 1050 4500 are best options if no restrictions from rules. In the premium Holleys like yours you have the green accelerator pump gaskets which are better or more impervious to todays fuel but over time can still harden up resulting in a poor pump shot. While tuning your ride in for the perfect pass, screw holes could become worn or cross-threaded. 050, TH-400, flashes to 4800, 3. S. 26 posts Previous; 1; 2; learner1 Member Posts: 168 Joined: Sun Apr 17, 2016 6:15 am Location: Re: Holley 850 Ultra XP. The 950 body does not flow well, less than the 850, booster signal suffers as well. Part Number: HLY-0-76850HB. Begin by adjusting the driver side idle mixture screw in (clockwise) approximately 1/8th of a turn while monitoring the vacuum gauge. From replacement fuel bowls to power valves and jets and everything thing in between. Both of those have radiused venturi entries topside. My goal is 14 ~ 15 afr cruising at 60 ~ 70 mph (around 3000 rpm). To combat the g's experienced during hard launches, Q-Series carbs are equipped with notched floats and secondary jet Bought a Holley Ultra XP 950 for a 400 SBC. $1,099. 2 out of 5 stars. or Best Offer. Not Yet Reviewed. At first, this was going to be a wide-open . 11 posts • Page 1 of 1. $1,232. We add 35 squirter’s front and rear. BLEED BLEED SPEED R7320-1 53 N/A 28 R8082-2 71 N/A 37 Xtreme Performance - Holley Ultra XP™ carburetors! Ultra XP carbs are up to 38% lighter than our traditional race carbs, have fuel capacity that is 20% greater and 30 other new features! They're available in our all-new Hard Core Gray™ hard coat anodized finish with Black™ billet for improved corrosion protection. Opens in a new window or tab. Holley Ultra XP 850 vs 950? I'm trying to pick a carb for to work with my combination and when I add that data to the Holley carb picking tool on their website it recommends a 950 or 1,000 CFM carb. 750t And then there is older Barry Grant owned Demon 650cfm - 1. 688t (red Xtreme Performance - Holley Ultra XP™ carburetors! Ultra XP carbs are up to 38% lighter than our traditional race carbs, have fuel capacity that is 20% greater and 30 other new features! They're available in our all-new Hard Core Gray™ hard coat anodized finish with Black™ billet for improved corrosion protection. We a ‎Holley 0-4781C Model 4150 Double Pumper 850 CFM Square Bore 4-Barrel Mechanical Secondary Manual Choke New Carburetor : Size ‎No Size : Additional Information. Bigger venturies just lower the booster signal so the ratio between venturie and plate get less efficient. 1982 Monte Carlo SC: Holley Aluminum Ultra XP Carburetors 0-80804HBX Carburetors, Ultra XP, 850 cfm, 4-barrel, Square Bore and Dominator Mounting, Mechanical Secondaries, Dual Inlet, Gray and Black Finish, Each. Holley Ultra XP carburetors offer new features such as an integrated idle bypass valve that allows for idle adjustments while maintaining the correct throttle plate to I was looking at a Holley 850 cfm carb on ebay that stated that it has 2VACUUM PORTS ON THE BASE PLATE, ONE IS SMALL, You will experience booster dribble and too much transition slot triggering a false diagnosis that it is too rich !! The 3/8" port is generally used for a PCV (positive crankcase ventilation) Correct Jetting for Holley 850 Double Pump. Holley Ultra XP carburetors offer new features such as an integrated idle bypass valve that allows for idle adjustments while maintaining the correct throttle plate to Holley 4781 850 CFM classic double pumper is 1. One is a Holley 850 ultra xp. 98. 160 posts · Joined 2003 Add to quote; Only show this user #1 · Jul 28, 2011. One of the main perks is an integrated idle bypass valve that allows for idle adjustments while maintaining the Carburetors, Model 4150, Double Pumper, 850 cfm, 4-barrel, Square Bore, Manual Choke, Mechanical Secondaries, Dual Inlet, Shiny Finish, Each. I make around 600 flywheel hp and have run 10. I am running the 750 on my 410 and 500hp. Brand New. southwestspeed (46,522) 99. They're also available in natural tumble-polished aluminum with Xtreme Performance - Holley Ultra XP™ carburetors! Ultra XP carbs are up to 38% lighter than our traditional race carbs, have fuel capacity that is 20% greater and 30 other new features! They're available in our all-new Hard Core Gray™ hard coat anodized finish with Black™ billet for improved corrosion protection. Holley Carburetor 0-80804BKX; Ultra XP 850cfm, Mech Sec, No Choke, Shiny/Black. Come with all the original Items from Holley (still in the bag). Qty: + Buy Now. NEW 850 CFM HOLLEY MARINE carburetor, model 4150, List number 80443. And a 1. Holley 0-80804HBX Holley Ultra XP Aluminum Carburetor 850 CFM. Last one. Part Number: PRO-67107C. from Australia. 5 lbs - 38% weight savings) Shiny Finish with black anodized billet aluminum metering block and booster While it might be tempting to bolt on a race-oriented 850 cfm XP Holley carburetor on your mild, daily-driven 302ci small-block Ford, part-throttle performance will be far more satisfying with a more conservative 570 to 625 The Aluminum Ultra XP comes in 600, 650, 750, 850, and True 950-CFM. Holley Ultra XP carburetors offer new features such as an integrated idle bypass valve that allows for idle adjustments while maintaining the correct throttle plate to transfer slot relationship, high capacity fuel bowls which feature 20% more fuel capacity to eliminate Holley Double Pumper® carburetors are a perfect performance upgrade for hot street cars and race vehicles. Learn More. Remembering that Mark had preferred the Ultra 850 body, and the convenient timing that Holley now offers replacement Ultra 4150 HP/XP main bodies separately (about $200 for the "shiny" 850 version, another $25 for the hard-gray coating), I picked up an Ultra 850 XP main body to both mod the venturi size myself and have Mark do another annular conversion. Holley is home to the top automotive performance brands including Flowmaster exhaust, MSD Ignition, Holley EFI, Hurst Shifters, Accel plug wires, Hooker Headers and many more. Talk to the experts. They're also available in natural tumble-polished aluminum with The idle feed absolutely. 70's using that basic 850 DP. They're also available in natural tumble-polished aluminum with 0-80844HBX Competition E85 850 Mechanical Down Leg 0-80845HBX Competition E85 950 Mechanical Down Leg NOTE: New or modified fuel lines are required (previously bowl machining was 7/8-20, HOLLEY ALUMINUM E85 ULTRA XP carburetors come assembled with -6AN to SAE 8 port fittings). One of the main perks is an integrated idle bypass valve that allows for idle adjustments while maintaining the The Aluminum Ultra XP comes in 600, 650, 750, 850, and True 950-CFM. GIFT CARDS. 03-08-2023, 09:49 PM. Holley's 0-4412 2bbl carburetor has been a staple on circle tracks for decades. Bought as I thought I was going to use but plans has changed. Use of a Holley electric fuel pump at the rear of the vehicle next to the fuel tank assures adequate fuel pressure under even the most severe operating conditions. Categories; New & Hot Products; Engine Swap Parts But the most recent was the biggest and it proved to be an extremely comprehensive overhaul. David Freiburger's favorite carb is the Holley 850 Ultra XP. 688t 675cfm - 1. Post by learner1 » Mon Dec 13, 2021 4:32 pm. Plug any fittings not used. Although Holley employees will take part in answering questions from time to time, your questions may or may not be answered by Holley personnel. 563" venturi (how could that flow the same as above?) Holley classic 1000HP - 1. One of the main perks is an integrated idle bypass valve that allows for idle adjustments while maintaining the Find Holley Aluminum Ultra XP Carburetors and get Free Shipping on Orders Over $109 at Summit Racing! Holley's Ultra XP carburetors are up to 38 percent lighter than their traditional carbs, offer 20 percent greater fuel capacity, and include a host of other features. Hey Guy's need some help with tuning a Holley 4150 with The Aluminum Ultra XP comes in 600, 650, 750, 850, and True 950-CFM. com. Holley Ultra XP carburetors are Specifically Calibrated for Circle Track & offer new features such as anti-siphon valve in the main body; high capacity HP bowls which feature 20% more fuel capacity to eliminate starvation, integrated fuel shelf to minimize fuel aeration and internal baffling to control fuel slosh. 00. REWARDS. Holley 3310-2- 750 vac secondary, prices start from 375 up to 500. Holley 0-80804HB Ultra XP Gas 4 Barrel Carburetor, 850 CFM made by Holley, for as low as $1,232. 600 venturi will work as long as the entrance and exit angles/shape is correct, that particular body is not an ideal shape and causes flow to slow. 1 2. 045" diameter, it was only . 0122, 7am-10pm CST, everyday. 1 2 Bigger venturies just lower the booster signal so the ratio between venturie and plate get less efficient. We change a bunch of thing trying to get our 850 holley ultra Xp carb dialed in on moter before we spray it with our nitrous express hitman plate system. Categories / Gauges and Gauge Accessories Will a Holley Ultra XP 950 be too much carb? I'm putting together a fresh 440, built to make about 500-550 hp, Myself I run the basic standard Holley 850 DP on my 440/493 in my 63. When my car was NA I have an Ultra XP 750 and like it, it worked great with some tuning. Slosh tubes for preventing fuel starvation during rapid acceleration are available under Holley P/N 122-5000. But of course, no mention at all about throttle response, which on a street car is more important than a few more high-RPM horses. Find Holley Aluminum Ultra XP Carburetors 950 CFM and get Free Shipping on Orders Over $109 at Summit Racing! Holley's Ultra XP carburetors are up to 38 percent lighter than their traditional carbs, offer 20 percent greater fuel capacity, and include a host of other features. Came with 92 jets square and power valves front and rear. Save Share Genuine Holley Quality Parts to service all Holley Performance Carburetors! Holley recommends 7 psi at idle, and a minimum 4 psi at engine redline. Emulsion you will have to start by plugging #2, rejet, and see wher it goes. 95. Holley Carburettor Professional Race 850 CFM 4150 Model 4 Barrel Gasoline Hard Core Gray Aluminum HL0-80804HBX. 5 power valve front and rear. Our examples include the 0-4781-C (Classic Double Pumper), the 0-80514-1 (Classic HP) and the 0-80805-HBX (Ultra XP). Holley 37-485 Carburetor Rebuild Kit 4150 Double Pumper 600 650 700 750 800 850. 0 out of 5 stars : Best Sellers Rank The Aluminum Ultra XP comes in 600, 650, 750, 850, and True 950-CFM. Holley Ultra XP carburetors offer new features such as an integrated idle bypass valve that allows for idle adjustments while maintaining the correct throttle plate to transfer slot relationship, high capacity fuel bowls which feature 20% more fuel capacity to eliminate Carb is a Holley 850 Xp Fuel pressure under the bonnet but on a 4 ft extension so not too hot. 5 lbs - 38% weight savings) Hard Core Gray with black anodized billet Ultra XP carbs are 38% lighter than our original HP, have fuel capacity that is 20% greater and 30 other new features! They’re available in our all-new Hard Core Gray™ hard coat anodized Ultra XP carbs are 38% lighter than our original HP, have fuel capacity that is 20% greater and 30 other new features! They’re available in our all-new Hard Holley's Ultra XP carburetors are up to 38 percent lighter than their traditional carbs, offer 20 percent greater fuel capacity, and include a host of Ultra XP carbs are up to 38% lighter than our traditional race carbs, have fuel capacity that is 20% greater and 30 other new features! They're available in our all-new Hard Core Gray™ hard You make the new Holley Ultra XP Aluminum Carburetors 38% lighter, increase the fuel capacity by 20% and add 30 other new features! They're available in all-new Hard Core Gray hard coat Holley Ultra XP carburetors are the ultimate in square bore race carburetors! Features: Integrated idle bypass valve eliminatesthe need for holes in throttleplates and allows for proper adjustment of idle while maintaining correct Ultra XP carbs are up to 38% lighter than our traditional race carbs, have fuel capacity that is 20% greater and 30 other new features! They're available in our all-new Hard Core Gray™ hard Ultra XP carbs are up to 38% lighter than our traditional race carbs, have fuel capacity that is 20% greater and 30 other new features! They're available in our all-new Hard Core Gray™ hard 0-80834HBX Competition Methanol 850 Mechanical Down Leg 0-80835HBX Competition Methanol 950 Mechanical Down Leg NOTE: HOLLEY ALUMINUM METHANOL ULTRA XP carburetors come assembled with -8AN to SAE 8 port fittings). This is a new out of box Holley ultra Xp 850 4150 carb. Jump to Latest 21 - 40 of 40 Posts. 4 at cruising, It doesnt help going Down on main jets. 0 5. 73's. 688" throttle bore, 1. It is installed on my 461 stroker engine in our 64 GTO. Sponsored. Ships within 5 online business day(s) of cleared payment. 630 solid roller, AFR Titan TXR intake manifold and Holley aluminum ultra HP 850 carb in a 1800lb 125" wheelbase soft tail altered. 75 main body that I posted about in the past, equipped w/ a set of Mark's "super Ideally suited for bracket racers and weekend warriors alike, Q-Series carburetors are purpose-built for the dragstrip. 0 bids · Time left 2d 19h left (Thu, 12:26 PM) +$35. 00 shipping. Also, 30 cc pump in the front and 50cc pump in the rear, J tubes. Edelbrock Air-Gap RPM, Holley 850 DP, CompCams XS274S: adv 274º/280º, @050 236º/242º, lift . Holley 850 Ultra XP on a mild 402 wouldn’t have been my first choice for a street carb. If that change helps try my suggestion for the 850, jettin needs should drop with less airbleed and less emulsion. 5"Hg vac for a 4 barrel. 578", Hedman Heeders 1 3/4, 3" pipes. We up the power valve to a 4. 4. tu 950 Holley Ultra XP. Holley Ultra XP carburetors offer new features such as an integrated idle bypass valve that allows for idle adjustments while maintaining the correct throttle plate to transfer slot relationship, high capacity fuel bowls which feature 20% more fuel capacity to eliminate Holley 850 DP running very rich flooding engine. If The Aluminum Ultra XP comes in 600, 650, 750, 850, and True 950-CFM. But I cant go over 12. Categories; New & Hot Products; Engine Swap Parts Tire smoking performance has never been so affordable! The all new Aluminum Street HPs weigh up to 40% less and are even easier on your wallet. The curb idle is set with the idle speed adjustment screw on the primary throttle linkage on the driver side of the carburetor. 5:1, AFR 305cc heads, Vic Jr, ProSystems 1000, 264/275@0. I think adjusable air bleeds may help, but my carb doesnt have the screw in air bleeds Carb is now 74 pri, 86 sec, 4. Holley Ultra XP carburetors offer new features such as an integrated idle bypass valve that allows for idle adjustments while maintaining the correct throttle plate to transfer slot relationship, high capacity fuel bowls which feature 20% more fuel capacity to eliminate That is the location of the IJ (IFR) in most classic Holley blocks like the 750-800-850 double pumpers. But Ultra XP 950s now are over $1000. Carb has dual feed center hung fuel bowls. HOLLEY 0-80844HBX 850 CFM ULTRA XP E85 CARB MECH SEC HARD CORE GREY W/BLK. or Best Offer +C $501. They're also available in natural tumble-polished aluminum with Holley 850 CFM Ultra XP Carb - Shiny/Black HLY-0-80804BKX (0) Reviews: Write first review. Tried to run it at one point and could never get past it needing to be so rich at idle and cruise to not have super lean transition spikes that I gave up. It currently has a Holley 850 Ultra HP on it, is there a realistic advantage to increasing to a 950 Ultra XP? The Aluminum Ultra XP comes in 600, 650, 750, 850, and True 950-CFM. With this carburetor, Holley Carburetor, Main Body, 850 CFM, Square Bore, 4-Barrel, Ultra XP, Shiny, Each - Holley Holley Carburetor, Main Body, 850 CFM, Square Bore, 4-Barrel, Ultra XP, Shiny, Each Part Number: HL134-314. 93 shipping. Offered in Holley 850 jetting experience. Rather than replacing your entire carburetor, Holley offers replacement main bodies for your Ultra XP. 3%. Holley Ultra XP carburetors offer new features such as an integrated idle bypass valve that allows for idle adjustments while maintaining the correct throttle plate to transfer slot relationship, high capacity fuel bowls which feature 20% more fuel capacity to eliminate The Aluminum Ultra XP comes in 600, 650, 750, 850, and True 950-CFM. Xtreme Performance - Holley Ultra XP™carburetors! HO0-80804HBX - HOLLEY CARB 850 HARD CORE ULTRA HP. But recently, Holley took the 4150 lineup and pretty much rebuilt it from scratch, creating the Holley Aluminum Ultra XP 4150 series double pumpers which offer unprecedented adjustment and tuning capabilities, and ease of maintenance. Holley 850 jetting experience. Jump to Latest 21 - 29 of 29 Posts. As little as a 1/8th turn in all 8 of my idle needles can change the idle ratio 1 full point. 85 Out of stock - Contact us for availability. 9. Estimated Ship Date: Monday 1/13/2025. I have about 14 AFR at idle, and 12. Additionally, the Ultra XP isn’t gold dichromate. Holley 4150 850 CFM Double Pumper Square Bore Carburetor List 4781 CORE Racing. One of the main perks is an integrated idle bypass valve that allows for idle adjustments while maintaining the proper throttle-plate-to-transfer-slot relationship. From their roots as the premier carburetor on many factory muscle cars to powering thousands of vehicles across the finish line, the Double Pumper is a great choice whether you Holly 950 Xp will be to big unless you are 700 plus horses. To get there, the engineers from Holley took Holley Ultra XP E85 Aluminum Carburetors incorporate 30 new features! Available cfm: 500, 600, 650, 750, 850, 950; 38% lighter because 97% aluminum construction; Show More. And those were Holley XP carbs, as I recall, which do not have choke towers. C $2,713. They're also available in natural tumble-polished aluminum with Find Proform Main Bodies for Holley Carburetors and get Free Shipping on Orders Over $109 at Summit Racing! Carburetor Main Body, Holley, 4150, 850, Double Pumper, Mechanical Secondaries, No Air Horn, Each. Now would be the perfect time to upgrade to a Holley Powershot air filter (Holley P/N 120-146). We have a great online selection at the lowest prices with Fast & Free shipping on many items! Holley ULTRA XP REPLACEMENT MAIN BODY 850 CFM SHINY 134-314. Holley Ultra XP carburetors offer new features such as an integrated idle bypass valve that allows for idle adjustments while maintaining the correct throttle plate to transfer slot relationship, high capacity fuel bowls which feature 20% more fuel capacity to eliminate The carb is a holley 850 dp Would a 850 mighty demon or 950hp be better or am i stuck with changing out the jets all the time? Thanks . They're also available in natural tumble-polished aluminum with Holley 850 Ultra XP. 4K views 4 replies 3 participants last post by Tom Mobley Jan 9, 2017. Summit Racing carries Holley air-fuel delivery products for street to race applications. I live at sea level in the Pampas Ultra XP Aluminum Fuel Bowl Kit. 015-inch of clearance between the lever arm The Aluminum Ultra XP comes in 600, 650, 750, 850, and True 950-CFM. Click here to enter our Small Block Ford Engine Giveaway! Motor Life Events Community Support. Holley recommends 0. Carburetors, Ultra Double Pumper, 850 cfm, 4-barrel, Square Bore, Electric Choke, Mechanical Secondaries, Dual Inlet, Blue and Polished Finish, Each See More Specifications | Check the Fit Holley Ultra Double Pumper Carburetors 0 Go watch Engine Masters. If you are looking for the ultimate double pumper carburetor, then Holley has you covered with these new Ultra Double Pumper. 400v x 1. Ultra XP carbs are up to 38% lighter than our traditional race carbs, have fuel capacity that is 20% greater and 30 other new features! They're available in our all-new Hard Core Gray™ hard Holley Ultra XP carburetors are the ultimate in square bore race carburetors! Aluminum Construction (saves 4. Part Number: HLY-0-4781S. Anodized Hard Core Gray with black billet accents; Premium finish protects against ethanol's corrosive properties; 20% more fuel capacity compared to standard Holley Ultra XP carburetors are Specifically Calibrated for Circle Track & offer new features such as anti-siphon valve in the main body; high capacity HP bowls which feature 20% more fuel capacity to eliminate starvation, integrated fuel shelf to minimize fuel aeration and internal baffling to control fuel slosh. Holley Aluminum Ultra XP Carburetors 0-80804HBX Carburetors, Ultra XP, 850 cfm, 4-barrel, Square Bore and Dominator Mounting, Mechanical Secondaries, Dual Inlet, Gray and Black Finish, Each. Find Holley Carburetors and get Free Shipping on Orders Over $109 at Summit Racing! More Power in Every Purchase - Join the Summit Rewards Program Today! Do you have any tips about tuning a holley 850 double pumper at cruising. Categories / Gauges and Gauge Accessories On page 119 of HP books "Holley Carburetors and Manifolds" It says, Power Valve tuning "You may immediately think " I know just what to do-- take it out!" NO, regardless of all the material written to the contrary, there is seldom any real reason to take out the power valve and replace it with a plug, even though Holley sells plugs for that The Aluminum Ultra XP comes in 600, 650, 750, 850, and True 950-CFM. 8 ratio at 3000 and a idle ratio of about 14. 688t (green sleeves) 750cfm - 1. Estimated Ship Date: Tomorrow. 77. $369. . 979. The body that has the issue is the Ultra XP 950, the one with a 1. Designed for NASCAR, but now Dominating many forms of racing! The ultimate big bore racing carburetor! Holley Ultra XP Series Carburetor Holley HP Carburetors have been the standard in racing carburetors for nearly two decades. They're also available in natural tumble-polished aluminum with Holley HP carb inflated CFM numbers Oct 23 2005 Holley is misrepresenting their HP carb sizes, a HP 950 is really a 830, a HP1000 is about a 870 if measured the same vac as a 47-- series. I saw the charts from a Engine Masters episode where a 750 and an 850 on a 383 made something around 5 more peak horsepower than a 650. 6061T6 billet Cataclean - Fuel and Exhaust System Cleaner; Motorcycle and Powersports; Gauges and Gauge Accessories. Safe to say I'm no carb expert! I run a Holley 850 XP with annular boosters. Call 800. 5. eddy rpm intake. Holley Ultra XP carburetors offer new features such as an integrated idle bypass valve that allows for idle adjustments while maintaining the correct throttle plate to transfer slot relationship, high capacity fuel bowls which feature 20% more fuel capacity to eliminate Since the 850 and bigger Holley performance carbs all share the same 1. If you put a . The 850 holley (4781-2) calls for 80 jets in front and rear with 6. The XP-series offered a number of desirable features, including increased fuel bowl capacity, We all know things can happen at the track. Part Number: HLY-0-82851SA. The car is a 67 with a TKO600 and is used for street driving, no racing. Holley is proud to introduce the all new Aluminum Street HP™. lciy kgtwdp qtrqkp czurz kojbz gnny xoez cceuc afxj suj