Holley 4412 vs 2300. 5 psi of boost.

Holley 4412 vs 2300. Exploded View and Nomenclature Manual for Models 2010, 2300, 4010, 4011, 4150, 4160, 4165, 4175, and 4500 WARNING! These instructions must be read and fully understood before beginning installation. Has anyone ever ran a Holley 2300 on a 300-6? I have a few 600's that share parts with newer modular 2300's and am curious as to their use on a 300. 7 psi of boost while the Super Sniper 2300 can handle up to 650 hp and 21. Holley manufactures each carburetor with a set of jets that Dec 17, 2020 · How to ensure your Holley carburetor is using the right power valve for your engine. Air bleeds are responsible for determining the amount of air that will mix with each circuit in the metering block. 2300 Flange. No choke tower for unobstructed air flow. The power is a vacuum-operated fuel valve that is designed to enrich the fuel flow to the engine under varied vacuum conditions. Aug 16, 2014 · So the carb in question is the Holley 2300 List #4412 2 barrel. Should you need information or parts assistance, please contact our Technical Support at 1-866-464-6553 or 1-270-781-9741, M-F, 8 a. Excessive leanness could result from the limited flow capacity of the two-stage valve. Shop Now at the Guaranteed Lowest Price! May 6, 2009 · Alright, so here is the deal I plan on swapping out my old Carter BBD carburetor with a motorcraft or Holley. Now the promotor wants OEM 2 barrel on Cast iron intake, with a Hyd cam. If you need a 2bbl for it I'd take a look at your local CL for a used 2300 of the more typical aftermarket Holley variety. HOW MUCH BETTER IS THE NEW 4412 XP? HOW MUCH MORE DOES A 4 BARREL CARB FLOW THAN A 2 BARREL? WHy IS THE FLOW RATING DIFFERENT FOR A 2 BARREL THAN A 4 BARREL? Sep 4, 2015 · Get the Best Performance with Holley 0-4412CT Circle Track 500 cfm 2-bbl Carburetor Dichromate "Gold" finish 0-4412CT parts at JEGS. Feb 13, 2005 · The 0-4412 is designed as a stock replacement for 2BBL street applications as well as being mandated for some oval track racing sanctioning bodies. We have Many hard to find Parts in stock With same day shipping on most in stock items. ) on a stock 390 with a kickdown lever for the C6 automatic tranny. 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. It idles smooth and has Oct 8, 2013 · Re: Holley 4412 or Rochester 2G by Brian W » Tue Oct 08, 2013 11:56 am 4412. Whether you are looking for a replacement carburetor to replace your tired and worn factory 2BBL or one to push you to the finish line on Saturday night, the Holley 0-4412 Performance 2BBL is the perfect choice. Holley 2300 Carburetors Holley 2300 model carburetors are perfect for racing classes where 2-barrel carburetors are required, or for hot rodders looking for something different. I see several 2100 knockoffs on ebay for less than $100. & Sat 9 a. The internal float adjustment is accomplished with the fuel bowl off the carburetor. On a 9 to 1 comp EQ spec head deal a good gauge legal 4412 is about 30hp better then a good legal Rochester 2bbl. But, once you know how power-valves work, it’s easy to select, troubleshoot, and install the right one for your application. in Hard Core Gray with Black billet aluminum metering block and base plate. The video explains the various jet sizes, and how they affect engine performance. 5 psi of boost. The holley came off an International Scout w/ a 266 V8 and as far as I know it was the stock carb for that engine. The 0-4412 is designed as a stock replacement for 2BBL street applications. I'd like to hear some experiences Jun 4, 2019 · GENERAL GUIDELINES FOR ADJUSTING BRASS AND NITROPHYL FLOATS Two methods of float adjustment are provided for with Holley performance carburetors depending on the style of float bowl and needle and seat assembly employed. The choke assembly has been removed for unobstructed airflow, plus it has been specially calibrated for circle track Oct 5, 2025 · CCS - Pro Series Holley 4412 (750 CFM) 2300 HOLLEY TWO BARREL CIRCLE TRACK Carburetor Collectibles Specialty (63810) 99. At this time I don't really want to run a 600 Apr 14, 2015 · When it comes to tuning a Holley carburetor the power valve has always seemed a mystery to many. Whether you are looking for a replacement carburetor to replace your tired and worn factory unit, the Holley 0-4412 Performance 2BBL is the perfect choice. I know it needs a rebuild, because of the hard Quick Fuel Technology delivers the ultimate high-performance carburetors. In about 1966 (Ford Total Performance), and again in 1969 (Mopars Mass Transit System and Chevrolet Pefromance part numbers), a string of Tripower variants used hacked up versions of the 280 and 350 Holley with vaccum vents and Holley 500 CFM Ultra XP 2BBL Carburetor, HLY-4412HB (0-4412HBX) is the latest iteration of the classic Holley 0-4412 carb. Keep in mind, you will not have the dual inlets on each bowl like you would on an actual Dominator bowl. Jan 24, 2014 · Rebuild and Adjustment Manual for Models 2010, 2300, 4010, 4011, 4150, 4160, 4165, 4175, and 4500 WARNING! Jul 5, 2012 · Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor, By Properly Adjusting The Accelerator Pump Assembly. So the question Is, which one is going to be able to bolt up to your flange? Aug 12, 2006 · Some times we run with a 4412, but I havent dyno'ed that combo yet. Has the 2 barrel Holley 2300. Holley jets range in size from 40 to 99, with the stock jet size differing based on the carburetor model and engine application. Float Bowls for Holley CarburetorsCarbs Unlimited has Rebuild Parts and Restoration Parts for All Types of Carburetors, including rebuild kits, floats, pulloffs, and chokes. Apr 3, 2024 · Buy Carburetor Replacement for Holley 0-4412S 2300 500 CFM 2 Barrel with Manual Choke Carburetor Compatible with GMC CJ5 CJ7 F100: Carburetors - Amazon. to 3 p. m Fits: Holley 2300, 2305, 4150, 4160, 4165, 4175, 4180, 4500 Carburetor Rebuild/Trick Kit Rebuild Kit Type: Trick kit Quantity: Sold as a kit. I just rebuilt the motor, and it runs pretty goodbut im sure i could be getting better performance from my stock motorcraft 2150 2bbl. The cam isn't an issue. Which Holley did you get? My 350 CFM two barrel Holley came with 62 jetssupposedly set and jetted at sea level. that one above is the 2300 series progressive. Features: Choke Mar 5, 2013 · I have a 0-4412 Holley 500cfm carb on my stock 345 in a Scout II. The original Holley 0-4412 has powered thousands of racers to the winners' circle! How do you make it better? Add the proven design elements of the popular Ultra series for more tunability, more durability, more weight savings and more features! The Ultra XP 2bbl carburetors feature all aluminum construction for nearly 50% weight savings over their zinc counterparts, contoured venturii inlet Jun 13, 2007 · Fuel Injection, Carburetion & Fuel System - Holley 2300 Fuel Inlet - I just have a quick question I got my 2300 holley 4412-S in today and I'm going to put it on when I get home this afternoon but does anyone who has one of these know what size the fuel inlet fitting is. the holley/weber is the 5200 series with the much smaller bolt pattern i do believe. Feb 7, 2023 · As a sixpack owner, I am much more familiar with the 2300 holleys, so that is what I would run. With 500 CFM of crisp airflow, a manual choke, and Holley’s legendary 50cc accelerator pump, this carburetor delivers reliable power and response at every RPM. This spacer will also work on on any intake manifold that has the 2bbl Holley bolt pattern. If your car or truck is equipped with a Holley four barrel carburetor and stumbles upon acceleration, more than likely the carburetor needs an adjustment to the accelerator pump assembly. Never had a weber, but I'd bet it's a pretty good carb too, but I would be much more familiar with the holley. with a 302 3spd auto. They are carbs that were returned under warranty. I believe most people are attracted to the 4412 due to its slightly lower cost (compared with the 7448) and the *500 cfm* image of extra power. We supply the spacer with 2 gaskets and all the required mounting hardware, including the correct metric bolts to use on the stock Ford intake Specification Manual for Models 2010, 2300, 4010, 4011, 4150, 4160, 4165, 4175, and 4500 WARNING! Apr 29, 2011 · 1973 - 1979 F-100 & Larger F-Series Trucks - Motorcraft 2100 vs Holley 2300 - Okay, so I have a motorcraft 2100 on my truck right now. I'd stick with this carb. I am told these carburetors are NEEDLE & SEAT CROSS REFERENCE199R10684 Jul 14, 2010 · You've heard of them, but what do they do? Air bleeds, sometimes referred to as "air jets" or "air bleeders" play a vital role in the operation of your carburetor. m. Holley 350 mounting base Jump to Latest 13K views 10 replies 4 participants last post by subaruboy Jan 26, 2015 S Nov 19, 2019 · Don't just take your brother or your friend's advice and jam the biggest carb you can find onto your engine. 98 / EA Quantity: Details Carburetor Rebuild Kit, Fast Kit, Holley 2300 Carburetors, Kit Our catalog Mar 22, 2013 · rpm range is 4000-8000 automatic trans flexplate with ram coupler holley 4412, 3 in. Nov 15, 2012 · Buy Holley (0-4412CT) 2300 Series Race Carburetor: Carburetors - Amazon. Dec 8, 2010 · Another carb worthy of using on the IH v8's is the 2bbl Holley list #7448 "2300" series mixer. The 0-4412 and 0-7448 carburetors are designed as a universal-type, 2 barrel carburetor. Jun 2, 2009 · The electric choke set for the "other" 2300 (the list 0-4412/500cfm) will not work at all on the 7448 carb you now have! Not only is the vacuum source arrangement completely different, so is the replacement fast idle lever set. Well, I'll be taking possesion of a List 0-7448 350 CFM carb here soon. There are many throttle body gaskets used on hundreds of different 2300 list carbs! $44. Jul 7, 2019 · Autolite vs Holley, don't know cfm on Holley so don't know if it is 350 or 500. 8% positive Oct 27, 2025 · 2 Barrel 2300. The 0-4412C is easily the winningest two barrel carburetor on the market, used for decades in circle track racing around the world. The kits contain all of the parts you need to perform a complete rebuild on your Holley carb, including a vent baffle, high-flow needle and seat assemblies, high Jan 30, 2017 · Yes, Holley 0-80350 is the electric choke 350 cfm cab that I installed. Price is for 1 riser. 060” (this includes the 0-3310 and the conventional double pumper line, which require high-capacity power valves). Feb 13, 2019 · Holley 2 Barrel 4412 Carburetor Hi Guys, I have a stock Chevy 283 motor, Block Casting Number: 3849852 – F051G8F, Power Pack Heads Casting Number: 3795896, 2 Barrel Intake Manifold Number: 3973467. Holley 0-4412C Features: The 0-4412 is designed as a stock replacement for 2BBL street applications as well as being mandated for some oval track racing sanctioning bodies. Whether you are looking for a replacement carburetor to replace your tired and worn factory 2BBL or one to push you to the finish line on Saturday night, the Holley 0-4412 Performance 2BBL is the The 0-4412 is designed as a stock replacement for 2BBL street applications as well as being mandated for some oval track racing sanctioning bodies. There should be no issues with using a fuel bowl from a 4150 on a 4500 just as long as you are using Double Pumper bowls with an accelerator pump on both sides. 8/351M, 6. The 4412C Holley carb is easily the most winningest two barrel carburetor on the market and comes out of the box ready to run. 2300 rebuild kit compatible with Holley 2-Barrel 2300 0-80350,0-4412S, R4412, R9011 Carburetor rebuild kit 100+ bought in past month Add to cart Dec 24, 2012 · I picked up a used Holley 2 barrel 350cfm carb for my 305 dd and I'm going to rebuild it but I'm unsure of a good starting point with jet size. It leaks gas, looks like ****, and a rebuild may or may not save the poor old thing anyways. 4” 4 bbl and 40. The 0-4412 is easily the winningest The 0-4412 is designed as a stock replacement for 2BBL street applications as well as being mandated for some oval track racing sanctioning bodies. Will it bolt in place of the 2300? I don't need the CFM, but a good steady idle. . This will allow you to use a large Rochester 2GC two barrel intake manifold and bolt on a 2300 or 4412 0-4144-1 & 0-4365-1 Holley two barrel carburetor without modifying your intake. 9L / 300 - how about a Holley 2300? - I have a few spare parts for the Holley family of carbs. I dropped the jets down two sizes to 59 cause I'm almost 4000 feet above sea levelruns better and is less thirsty 4412 2300 Holley Carburetor Intake Spacer Performance 1" Riser This is a 1" aluminum riser for the Holley 4412 2300 carb and will fit other models as well. The amount of air Jul 2, 2009 · That one is for a 500cfm version of the 2300, most likely an aftermarket replacement list 4412 (pic of one of those is in the 2300 sticky thread). These model 2300 carburetors bolt directly to most Ford 2 barrel V-8 manifolds. But, at the same time, most of Holley’s Performance and Race carburetors still have a choke system, to make cold starts easier for street use. I'm unsure of the diaphragm (pump) size. While 2-barrels were traditionally found under the hood of more economical cars, the Sniper 2300 can support up to 350 horsepower and 14. Mar 8, 2023 · Setting the idle mixture and speed on a carburetor isn't the most exciting or elegant subject, but it is a necessary adjustment that often is overlooked or worse, set up incorrectly. 95 View Part Holley Holley Performance 2BBL Carburetor - Factory Refurbished 500 CFM - 2300 - Shiny - Gasoline Part# FR-4412S (2) Free Shipping Sep 3, 2013 · Check out how to tune your two-barrel carburetor! We take a Holley two-barrel carburetor and tune it for better airflow and more horsepower in this tech article. It should be right below this post. Switching cams will directly affect the movement of the accelerator pump lever and, subsequently, the amount of fuel available at the pump nozzle. Virtually every carburetor you come across will have these which make this a universal discussion. These Model 2300 carburetors will bolt directly to all Ford 2 barrel, V-8 manifolds. 99 Feb 25, 2024 · I've been running a Holley 4412 2barrel (2300 series, with smaller jets for economy) since 1972 when I purchased the vehicle. Since these carbs . These carbs will pass tech gauges and produces great torque and horsepower. Apr 28, 2024 · Fit To Holley 2BBL Model 2300, R4412, R9011,0-8350,4412S Carburetor rebuild This 2300 Ultimate Holley 2-Barrel Carburetor Kit With high quality gaskets, Included the parts for your Holley carburetor rebuild, High-flow needle and seats, reusable needle and seat gaskets ,reusable bowl screw gaskets idle mixture screws, needle and seat nuts and screws, accelerator pump squirter check valves Jul 18, 2021 · The Holley that would work is the 2bbl marine units, I'd call Holley and ask them what they recommend before buying if the Rochester is too far gone to rebuild. Apr 7, 2023 · Choosing the right Holley 2 barrel carburetor for your vehicle is essential in ensuring optimal engine performance. I wonder how much differance there will be from the 4412 to the 2GC. Nov 12, 2005 · I tried a 4412 on my 304 some years back, and was greatly dissatisfied with its characteristics. Jun 16, 2013 · The Holley 500 CFM 2300 series (0-4412) 2 barrel might be a good performance up grade. holley 2bbl?? - ive got a 81 f-100. Genuine Holley Quality Parts to service all Holley Performance Carburetors and other brands! Holley offers a variety of replacement and upgrade metering block and plates for your Holley Carburetor Carburetors built for performance! The Carburetor is the foundation of our expansive line of fuel system components! Sep 18, 2017 · My off road 1969 needs a new carb. Mar 16, 2010 · OK, I posted my old article I wrote for the BB 11 years ago for the 2 conversions to the list 4412 Holley 500 CFM 20 years ago and 13 years ago. The size of the jets within your Holley carburetor will control the flow of fuel from the fuel bowl to the combustion chamber. The 0-4412 is easily the winningest two barrel carburetor on the market, used for decades in circle track racing around the world RWA1222 1" Holley 2BBL carburetor spacer is required when bolting a Holley carburetor onto a stock 2300 2bbl intake manifold (when the EGR plate is removed). Holley 2300 carburetors any good on a /6? Page 1 of 1 Page 1 of 1 Home » Board index » Tech Q & A REMAN HOLLEY 4412 500 CFM 2 BARREL MODEL 2300 HAND CHOKE Remanufactured 11 product ratings - REMAN HOLLEY 4412 500 CFM 2 BARREL MODEL 2300 HAND CHOKE $299. The choke has been removed but the horn remains and has been specially calibrated for circle track use. Holley Carburetor Numerical Listing Apr 25, 2014 · Holley's new Ultra XP 2-Barrel Carburetor is a redesigned version of the #4412, 500 cfm carburetor that's widely used in many circle-track divisions. Add a little performance to your machine the cheap way. It is advertised as a 350cfm carb, I have done the same swap from a 2100 to a 2300 (some old IH list #) on a 304/727 Scout II and noticed incredible difference in the way it drives. These Holley Trick Kits are the inexpensive solution to fuel slosh in your carburetor. com FREE DELIVERY possible on eligible purchases Feb 17, 2019 · Whether you are looking for a replacement carburetor to replace your tired and worn factory 2BBL or one to push you to the finish line on Saturday night, the Holley 0-4412 Performance 2BBL is the perfect choice. It has been on there for a couple of years and it runs very well. This new 500cfm 0-4412CT carburetor shares the hugely successful features of the original, but with changes aimed directly at circle track cars. (bucket truck). First off I want to make sure I found the right adapter, it is made by Trans-Adapter and is P/N TRD-2086. I took the carb apart and the jets that are in it are #53 and the power valve is #75. I just acquired this in a trade from my uncle for a fomo 2bbl, so this isnt weather its a good carb or not but a question of what jet sizes to use. Whether you have a hot street car or a dedicated race machine, QFT carburetors deliver. My 305 isn't stock, it Oct 10, 2013 · Ford Inline Six, 200, 250, 4. This 450 CFM carburetor has a 1-3/8" venturi and 1-9/16" throttle plate. The vacuum operated power enrichment system is controlled by a Power Valve that times the operation to your engine's specific needs. 8” 2 bbl on a Jamison D1400 Carb Master Flow bench using the latest Audie Tech software with a 2” open hole spacer. Whether you are looking for a replacement carburetor to replace your tired and worn factory 2BBL or one to push you to the finish line on Saturday night, the Holley 0-7448 Performance 2BBL is the perfect choice. I am sure that someone here has dyno'ed them back to back. May 30, 2011 · 4412 best/worst intakes , carbs , heads etc by madcowl » Mon May 30, 2011 12:17 am 0-4412c Carburetor Info PageNumber May 12, 2006 · Originally, Holley designed the 2300 series carb for AMC and International Havester in 1963 as a 280 cfm 2-bbl carb. See how the throttle bore cutouts are too large??? And the holes don't really match at all. com FREE DELIVERY possible on eligible purchases Nov 23, 2005 · Buy Holley HOL 0-4412S 0-4412S Model 2300 500 CFM 2-Barrel Manual Choke New Carburetor: Accelerator Pumps - Amazon. They are the internal (dry) setting and the external (wet) setting. Holley 0-4412S Details The 0-4412 is designed as a stock replacement for 2BBL street applications as well as being mandated for some oval track racing sanctioning bodies. As for the metering blocks, I would highly recommend that you NOT do this Oct 18, 2008 · 2-bbl. How do you find out what you need? This helpful walk-through will steer you through the various popular carburetor flanges and show you which options are available from Holley! Many of Holley’s Performance and Race Carburetors also have billet metering blocks, which have better resistance to fuel corrosion and lower chance of porosity in the fuel block. Do you really understand what your carburetor needs to be in order for your engine to be happy? Let us explain the details you need to now before you choose your next Holley carburetor! Oct 2, 2009 · I'm finishing up a stock refresh on my 231. The 0-4412 is easily the winningest Sep 30, 2005 · FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428) - motorcraft or holley - Hey all! I was wondering which is a better carb a motorcraft 2100 or a holley 4412. Quadrajet, Weber, Holley, Carter, Edelbrock, Motorcraft, Zenith Oct 12, 2022 · Learn about Holley carburetors troubleshooting where everything from basic troubleshooting tips to advanced diagnostics and tuning procedures are discussed in great detail. Both parts with physically bolt to a 4500 Dominator. collector-- wrapped with fiberglass wrap Models 4150 & 4160 3. It is located in the metering block, and The 0-7448 is designed as a stock replacement for 2BBL street applications as well as being mandated for some oval track racing sanctioning bodies. 2 carbs in over 50 years is a pretty good track record! I've run the Holley 350cfm 2bbl and the 500cfm 2bbl and the 350 always ran better on my stock 302 with headers. Mar 29, 2023 · So you've acquired a project, open the hood and find there's no carburetor or throttle body bolted atop your new engine. If these instructions are not fully understood, installation should not be attempted. NOTE: The 0-7448, 0-4412C, and 0-4412S are designed as a universal-type, 2-barrel carburetors. The jets are 76's, which I think are way too Nov 2, 2011 · Re: motorcraft vs. They also give instructions on changing the jets for increased performance. Jan 23, 2015 · Motorcraft 2100 vs. The 0-4412 is $437. Nov 8, 2002 · FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428) - Holley 4412 or 2300 - Which of these two carbs will best fit (linkage, etc. Two-stage power valve should not be used in any vehicle, which sees occasional drag strip use, or in any carburetors with power valve channel restrictions greater than . They do sell a kit (Holley 45-223) to convert from manual to electric choke for the 0-7448 model (but the 0-80350 is cheaper to buy) Dec 15, 2005 · Fuel Injection, Carburetion & Fuel System - motorcraft vs. All CCS Racing Series Carburetors are Dry Air Flow tested at 20. May 20, 2014 · Re: RARE Holley 2 bbl with progressive linkage by wil8115 » Tue May 20, 2014 11:44 pm just get a regular 4412 for circle trackin' . Hey, thanks for the info and link! The Holley 0-4412S 2300 Series 2BBL Carburetor brings race-proven engineering to your performance street build or circle track racer. com FREE DELIVERY possible on eligible purchases NumberNo additional parts found. Feb 16, 2014 · Re: Choosing between Rochester or Holley the original carb on your engine is a holley 2300 2bbl 500 cfm - and i cannot say any bad word about this carb. When these carbs are returned, we check them out and most of the time there is nothing wrong with them. Installation and Adjustment Instructions - 199R10688 CONGRATULATIONS on your purchase of the HOLLEY 2300 ALUMINUM ULTRA XP Series carburetor! We feel that you have purchased the finest performance carburetor manufactured today. Generally, they were simply adjusted out of working range by the installer. Specification Manual for Models 2010, 2300, 4010, 4011, 4150, 4160, 4165, 4175, and 4500 WARNING! Are you looking to rebuild or replace parts on your carburetor? Just insert your carburetor model or list number in the Carburetor Rebuild Component Selector below. The Holley 2300 carburetor was widely used in the 60s and 70s across several manufacturers. Now available in lightweight aluminum construction! Holley offers an assortment of different pump cams, each with uniquely different lift and duration profiles that are available under Holley P/N 20-12. When you think about it, it's kind This 500 CFM 4412CT Holley carb shares the hugely successful features of the original 4412C but with a couple changes aimed for circle track cars. intake (stock) 1 5/8 primary egual length header with 3 in. It came with a Holley 4412-2 500 CFM 2bbl on an adapter plate. to 6 p. The inlet is threaded, is it the same size as This is an official Holley Performance factory refurbished carburetor. Failure to follow these instructions may result in poor performance, vehicle damage, personal injury, or death. They are both 2300s. I haven't found any vacuum leaks on the Autolite yet but it is running at about 5-1/2 turns out of fuel screws w/ 17" vacuum. Factory refurbished carbs are not old worn-out carbs that have been rebuilt. spacer between carb and intake fuel inj. With “internally Jan 18, 2014 · The Holley 2300 would be my recommendation for a 2bbl for that truck, the question is if that particular Ford one is any good, there are several unique attributes to it. Dec 2, 2009 · Holley explains how the main jets on a four-barrel carburetor operate. It has a Holley 500 cfm 2 barrel 4412 carburetor with no choke. Apr 20, 2023 · Ford Truck Enthusiasts Forums Performance, Engines & Troubleshooting 335 Series- 5. Holley by tmcalavy » Wed Nov 02, 2011 10:02 pm Holley and Motorcraft jets are interchangeable. Holley carburetors have a power enrichment system that provides fuel to the main power circuit during heavy loads or under full throttle situations. Here's the proper way to handle this basic task. 6/400, 351 Cleveland Holley 2300 (0-4412) Dec 10, 2005 · The versions you are talking about comes in two different sizes, a 350 CFM rated referred to as Holley list # 7448, and a 500 CFM, list #4412. tx0hpi lszi rja47n1 f2cfb vj lfk ytcb40z hrk fni ul2i

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