Round up to next carb size from numbers provided. 750 cfm will only support a 496 to 5200 according to my charts. gn7 said: Its the 660s that are killing your milage. 1. Step 2. Your carb CFM should be 1.8 to 2 times the cubic displacement of your engine as a rule of thumb. Edelbrock 1405 Carburetor (Editor's Choice) The Edelbrock 1405 carburetor is the best carb for the Chevy 305 engine. Enter Volumetric Efficiency Of Engine. Marvin Sunderland. D = Cubic inch displacement of the motor. Get into the motor manuals that MAY be at your Public Library in the automotive section like Motor, Chiltons, Mitchell and hunt up what you need.. OR go to AutoZone, (or whatever?? Edelbrock performer 383 intake (Part number might be 2186) Mopar "purple" Cam. A stock Quadrajet carb flows 790-835 CFM depending on model, so don't use anything smaller than that. A-Team Performance 1902R Carburetor. [ (DxR)/3456] x [ (B/14.7)+1]=C. On your combo I would run a vac. Applying the formula for filter area, we came up with the following: 119.3 = (454 x 6700) / 25,500. The Volumetric Efficiency is a bit more tricky and is at . We have done that carb/intake install many times, and always with good results. Unscrew the fuel bowl bolts with a wrench and pull the fuel bowl off the carburetor. Enter Maximum Safe Engine RPM. The engine that was in the car was a 292, not the original engine or correct size. It's a good idea to check voltage at the pump to verify this. A new set of 650's would wake that thing right up. All Holley carburetors are differentiated by their capacity to flow air. $243.26 - $1072.84. It is refundable when you return the core. So, what size carburetor do you need then? 1. Complete Quick Fuel Carburetor Catalog. Only show this user. But even 650 cfm 1850s w/vac secondaries would be a better choice. The best way to decide is do the math. Carb Size. Then, take 1,920,000 and divide this number by 3,456 rpm and get 557 cfm, which calls for a 600-cfm carburetor if you're . 2. If you try this formula yourself, be honest with how much rpm the engine will see. Only show this user. Quick Fuel Specials. Generically speaking -. 2951000 / 3456 = 854. I run a little 650 Edelbrock on a 468 (I keep saying its a 600 cfm but I checked the box and its really a 650) but its just a street car with rpms mainly below 6,000. For example, your current elevation is 2,000 feet above sea level with a temperature of 70 degrees. Our units are not "one size fits all". 65 Mustang 289 C4. If you try this formula yourself, be honest with how much rpm the engine will see. 5000 = 723 cfm. Site Areas. With the A impeller, it's not going to want to pull too many RPM, so probably even a 600 cfm carb would work. First I start with a new Fuel pump , STOCK 75lph TBI fuel pump will only support about 230hp before the fuel pressure drops like a rock. Carb/TBI CFM Calculator. A 454 big-block that revs up to 5,900 rpm would need: 454x5900/3456=775 So, it would need a 775 cfm carb assuming 100 percent VE Of course, that high-performance street engine won't have 100 . sec 600, 650 or . Holley 650. I THINK they have tunnel ram specific carbs, but it's been so long since I had one. Unless you have a really souped up, hot, 302 (which I don't think you do) 650 is a little on the large size. Click to see full answer. will do nicely b/c it is a 750 Q-Jet! A 600-cfm carburetor may perform quite well on a stock 350 Chevy. To determine element height, let's assume the element will be 14 inches in diameter. The idle mixture screws may need to be enriched . For Denver: Take 0.948 (Denver atmospheric pressure at 70 degrees) x jet size (60) = new jet size (56.88) round up 57 would be the proper jet size to start at for a stock scooter using a 12mm carburetor. 405 sb combo - 11.87 @112.5. When choosing wire gauge, circuit breakers, and relays make sure to size them for the maximum amp draw. Gonna have to use the 454's accessories as well, in less you can find an older big block and take the p/s pump. 70 Chevelle 565 t-400 8.87 151 1.21 60' and 3200lbs Sold 3/18. Model: CHEVY & GMC TRUCK / MOTORHOME 8CYL 454 CID ( 4BBL ROCHESTER ) QUADRAJET. Up to 450 GPH =7.5 GPM= 5/8" or -10 AN. Most cars with a charging system and appropriate wiring can supply 13.5 volts to the pump. You can calculate that the jets should be increased . The RPM entered should be the maximum RPM the engine is to run (you know that RED LINE on your tachometer). Too small of a carburetor and the engine will be starved of fuel, too large and it will be choked. However, they can be improved. Even with about a 10% cushion, a 500 CFM carburetor will handle this engine great. It has a 450 horsepower rating and a 450 lb-ft of torque, which is great for a crate engine. Private Messages. Rebuilding a 57 engine. You'd be better off with a carb smaller than needed rather than something oversized that can lead to poor drivability and performance. Carburetor CFM Calculator 3. The purple and red lines show how many amps are used at different pressures. A-Team Performance 1903R Carburetor. Save the gasket that was pressed between fuel bowl and the carburetor's metering block (what the fuel bowl is bolted to). Also asked, what size carburetor do I need for a 350? I have a Holley that flows a little over 800 cfm and that will be going on my car at some point. 8.5-9.0 compression. Establish the current jet size of the jets within the Holley carburetor. Everything you need for anything you drive. « Reply #11 on: July 01, 2013, 06:46 AM ». This carburetor is fine-tuned and offers good driveability. Compression is maybe 9.8:1 with Edelbrock CJ heads, Blue Thunder intake, Comp XE274 hyd flat tappet cam and FPA headers in a 70 Torino with a 4spd and 3.5 gears. 06-13-10 05:09 PM - Post# 1929690. 4. Therefore, you should have a number 65 Holley power valve installed in the carburetor. You'd be better off with a carb smaller than needed rather than something oversized that can lead to poor drivability and performance. You can pick up a set of alum heads, air gap intake and a decent cam to work with the gears and TC you have. Carburetor Size Calculator. There's a simple formula to calculate just the right size of carburetor for your engine. So at 5000 rpm, your 454 only needs 656 cfm at 100% volumetric efficiency. Save the gasket that was pressed between fuel bowl and the carburetor's metering block (what the fuel bowl is bolted to). You just need to know that a different rated carb is what you need to do for now. A 600-cfm carburetor may perform quite well on a stock 350 Chevy. Some are, some aren't. Anyway, 750cfm is fine for stock to mild 454 big blocks. Air flow required is c.i.d. The Size of the engine can be in Cubic Inches or Cubic Centimeters. *. First off get rid of that dbbl pumper and get a vac secondary carb. 12:21 AM. If you want a better breathing engine because you put in a better intake and a cam and exhqust, you're looking at somehting more like an850cfm or larger carb. Required Data Entry. We stock Rochester, Holley, MerCarb, Weber, Carter & Solex carburetors for MerCruiser, OMC, and Volvo Penta . Columbia, MO, USA. Heres the formula to figure out needed carb size. with automatic transmissions. Take 350 ci multiplied by 5,500 maximum expected rpm equal 1,920,000. You have quite the range with a mild 302 through to a 347! I suggest a 950 carb. You take the engine cubic inch and multiply by the maximum RPM and divide by 3456. A mildly built 454 would probably act the same way on a 750. Carbs I have a Holley that flows a little over 800 cfm and that will be going on my car at some point. 67 coupe--5.0. VE is affected by intake type, camshaft grind and type, boost, and many other factors. H = A / (D x 3.14) + .75. Adjust the jets one size for every 2,000 foot change in elevation or for every 35 degree change in temperature. I would agree that around 400 HP is the realistic number, assuming pump gas and the stated "mild" cam. Manifold Vac. keep in mind that thats the minimum required, a fuel system has restrictions to flow rates like filters ,fitting and internal line flow restrictions requiring you to have a slightly higher actual supply volume and pressure. Hi All, I first must relate a math formula for CFM on any NA or naturally asperated engine, here goes. We use the highest quality ethanol resistant parts. Year: 1978 1979 1980. When choosing wire gauge, circuit breakers, and relays make sure to size them for the maximum amp draw. x rpm / 3456. The engine size is the displacement in cubic inches. It was originally an 87 TBI 454 but I blew that up and built it different (no more TBI). How do I tell what size carb I need? This rebuilt carburetor has a core deposit. Carburetor Size Calculator. Do not over-esti-mate RPM column A. However, it does make the intake a little less sensitive to carb CFM. Check Price. Carburetor sizing. I run a little 650 Edelbrock on a 468 (I keep saying its a 600 cfm but I checked the box and its really a 650) but its just a street car with rpms mainly below 6,000. All units are flow bench tested. If it were stock I would just go like single 2.5'' and call it good, but the engine is not stock. In response to HAL_396. Typically the carburetors (s) will need to be enriched by 5 to 10 percent on the primaries and 10 to 20 percent on the secondaries. And the good news is that phenolic resin spacers can be stacked, the same way as wood or . 40+ Years in the industry. Find CHEVROLET 7.4L/454 Intake Manifold and Carburetor Combos and get Free Shipping on Orders Over $99 at Summit Racing! The Size of the engine can be in Cubic Inches or Cubic Centimeters. Now comes the carburetor. Hard to go wrong with holleys, I have used a 750 vacumn sec 3310 carb with good results (ran high 11s with it), had to play with the squirters and accelator pump cam to get it to work well, but it is hard to beat for driveability. C = Maximum CFM required. 1.8. Aug 20, 2013. Go to Summitracing.com and look up an intake for the year/make/model of the engine. This rating is expressed as airflow in cubic feet per minute (cfm). Even with about a 10% cushion, a 500 CFM carburetor will handle this engine great. 92' GMC C-1500 454/4L80E/14 bolt. Will this big of a cam require a larger carburetor than I am using now (600 cfm holley), or do I just need to do more adjusting on the carb and timing? . Get a Quote. I used a 600cfm edelbrock on a stock 454 and at times it was not enough carb. Carburetor 499059 for Briggs & Stratton 4 - 7 Hp Vertical Shaft Engines. The 292 was not rebuildable. Even with about a 10% cushion, a 500 CFM carburetor will handle this engine great. Go with the TB since it is fairly cheap. Here is what it says depending on the max rpm you plan to run to. Just "Bolt on and Go". and you only think it is over carbed because the 660 is one tuff SOB to get set up right for part throttle acceleration. Mar 24, 2010. Short of a Pro Mod or Funny car, ther aren't many engines approaching 100% efficiency. The car is pretty stock except some minor changes. However, the minute you start weaving in power adders like a hotter cam, a dual-plane performance intake manifold, and aluminum heads you're going to need 700-750 cfm. I'll give you my take on sizing a carb for a 350 Chevy. 7000 = 1013 cfm. Share. Call Holley and see what they say. . 726 X 1.3 = 943. Jan 13, 2021. New to this forum and new to owning a classic Thunderbird. 6500 = 940 cfm. If your divided number falls on an even number, you should select he . 78' K-20 355/SM465/twin stick 205 6" on 36's. 14 bolt FF/big bearing Dana 44 4.56 gears. In such instances, a bigger carb on, say, a 383 shows less of a gain over the 750. Apr 21, 2005. a 24mm carb would be plenty for motard on a chinese 110 motor. Hello, I am new to the forum and this is my first post :headbang: I am currently thinking about what carburetor to put in my 1970 Road Runner. The formula for calculating how much CFM (cubic feet per minute) an engine requires is: CFM = Cubic Inches x RPM x Volumetric Efficiency ÷ 3456. However, if your supercharged engine is primarily driven on the street at moderate engine speeds (under 4,000 rpm), you don't necessarily need a larger carburetor. Call Us at 541-942-5920 for the correct carb for your application. 2.Select engine size (cubic inches) in column B. 854 X .85 = 726. Let's apply these formulas to a carbureted 454 cubic inch big block V8 with a 6,700 rpm horsepower peak. 5500 = 796 cfm. Carburetor and Manifold Combo, RPM Air-Gap Manifold, 800 cfm AVS2 Carb, Chevy, Big Block, Oval Port, Kit . Best Carburetor for 454 Chevy Truck. Its gonna need that fuel when you get into it. On my flow bench, an 850 Holley flows between 849 and 851 cfm dry (no fuel going through it) but even a mild 454, unless really poorly spec'd, is still an air-hungry engine. Required Intake CFM This calculator will help you determine your engine's intake volume requirements. Step 2. Then 1,659,625 ÷ 3456 = 480 CFM. . What size carburetor do I need for my scooter? Take the clam shell mounts off the small block and bolt on the big block. carb cfm needed= (rpm x displacement) / 3456 x VE% (volumetric efficiency) Your engine will have a VE of around 87-90%. Paul. No changes , easy choice up to about 350 hp Alternatively, I'd go 600 Edelbrock, do not go 500 Edelbrock, they have some odd casting that really hurt airflow. They can work real well for mild to wild 454 big blocks but a step up in CFM will pay off with more power. I think the 600's would be a good choice too. After messing with my brothers 1992 454 TBI dually truck and now my 1991 TBI 454SS, I am going to say, I am not a big fan of the 91-95 GEN V big block engine. However, the minute you start weaving in power adders like a hotter cam, a dual-plane performance intake manifold, and aluminum heads you're going to need 700-750 cfm. However, the minute you start weaving in power adders . The RPM entered should be the maximum RPM the engine is to run (you know that RED LINE on your tachometer). X3-662 OEM. I have used a 600 Holley and it was hard to tune. If you are concerned about fuel consumption, then you could do a CFM of 750 to 800. So what can you do to retain true street carb capabilities while feeding a big-block with the additional air it wants? As of now, the timing is set at around 12º BTDC. A 600 would be about perfect. 70 chevelle. CI / CC. Then 1,659,625 ÷ 3456 = 480 CFM. I am going wait and see. For example, your current elevation is 2,000 feet above sea level with a temperature of 70 degrees. 650. Fig. You'd be better off with a carb smaller than needed rather than something oversized that can lead to poor drivablility and performance. As long as your engine is getting what it needs and when your good. If you have an automatic transmission, you will need a vacuum sec. So at say 6000 rpm, with a 89% VE you would need 540 cfm carb . 85% is a good estimate for most street motors, so 656 x .85 . Unit. carburetor size = engine size × max rpm × efficiency ÷ 3456. Mike. A stock 454 carb. You can calculate that the jets should be increased . Or 454 x 5000 rpm = 2270000/3456 = 656.83. The following formula below will help you determine the correct size Carbs for any blown application. b454rat. Only show this user. This power valve system will add approximately 6-8 jet numbers (depending upon the size of the power valve restrictor size in the carburetor) of fuel to the engine under demand. Identify marine carb by Sterndrive, Engine & Year. 2" throttle shaft and plate would need to be used. This means you'll build low to mid-range torque. 6.18. It's a good idea to check voltage at the pump to verify this. carburetor motorhome, chevy truck, gmc truck, 7.4 liter, 454 . Distributor Replacement. Click to see full answer. Quote from: GONMAD on June 30, 2013, 08:28 PM. Engine: 454 CID 7.4 Liter. Automotive Mechanic. Connect a vacuum gauge to a constant manifold vacuum source and attach it to the dash in plain view, make a pass. The manufacturer recommends a Holley 4-barrel carb to fulfill the performance specs of this engine, which we kept in mind when compiling our list. (better manifold = lower number) 454 X 6500 = 2951000. Here are my specs: 383 engine. If you try this formula yourself, be honest with how much rpm the engine will see. Carburetor Help and Support | THE KAWASAKI EN450 / 454 LTD . ), and ask the Parts Person what Q-Jet came stock on the 454 motor you are going to . Quick Navigation Carburetor & Fuel Pump FAQ Top. Here is the formula in numbers: 454 x 4400= 1997600 div by 3456=578 cfm. I have heard that the Holley's are more tempermental but perform better. 23 years of experience. Horsepower. If the carb is too big, you'll likely have problems with idle quality. 420 sb combo - 10.93@120.76mph. I have 12.8:1 air/fuel mix in the primary and 13.1 in the secondary. 1968 Mustang California Special. Contents. Holley O-80457S Model 4160 600 Carburetor. Save. Engine: 350cid 400cid 454cid. Step 2. 305, 307, 350 or 454 CID 4Barrel Rochester (Remote Choke) 8 Cylinder 5.0/5.7/5.8 Liter 305 or 350 . I do believve that the stock carb is a Quadrajet carb which is pretty much a 780 of so cfm carb. Carburetor Numbers. At the stripe look at the gauge if it reads more than 1-1.5" the carb is too small if it's less than 1" it's too big. As a matter of fact, we do glass work and all types of pump work too. I will not rev over 6k and probably rarely over 5,500 since bottom end is pretty . If you need to keep overall costs down without compromising quality, a high-flow dual-plane intake with a plenum cutout (shown) used with a 750 vacuum secondary Holley works well. CARB SIZE MATTERS: What size carburetor do I need? Your Price: $222.49. More Street-Carb CFM. Choosing the correct size carb is essential for the proper operation of the blown motor. These tables offer a quick look-up if you know your year and engine size/model. We have been building and specializing in BOAT engines for over 30 years. The calculator will tell you the cfm range you need. Up to 900 GPH = 15GPM 3/4"or -12 AN. The purple and red lines show how many amps are used at different pressures. With the bowl off, the jet (s) are exposed and can be identified by their brass color and center orifice. 4-Hole Plenum Spacers. The calculator shows 581 CFM for 5000 rpm, 402 cu in (.030" over 396), based on 100% VE (doubt that it's that efficient). Unscrew the fuel bowl bolts with a wrench and pull the fuel bowl off the carburetor. Settings. ported for 2.19'' valves. Comp springs. Hi there. B = Maximum blower boost. A 600-cfm carburetor may perform quite well on a stock 350 Chevy. I have read and been told that a 750 is too much but I have an article on building a strong street 351W and the carb recommendation was the 750. Step 2. I think the 850 is fine. This type of spacer will increase the velocity of your vehicle's air-to-fuel charge. 6000 = 868 cfm. Only show this user. With a bore of 4 inches and a stroke of 3.8 inches, the Stroker's displacement is 6.27L. Logged. Most 'universal performance' 600-650 carbs are calibrated for small blocks. Once you get the carb set up via the instructions then you can fine tune it. The car was purchased originally with the 312, which I have been able to find and now in the final stages of rebuilding the 312. - pi . 10,496. With the bowl off, the jet (s) are exposed and can be identified by their brass color and center orifice. For the carburetor swap out, you will need to have a least a CFM of 850 or 950 for a big block GM engine. 1972 402/454 heads. The cam I am running in my 454 bored .30 is a comp cam XR270HR part# 11-422-8. There are people who alter carburetors for more flow, but that knowledge is way down the road for you. 2 Locate the total carbohydrate in one serving. Adjust the jets one size for every 2,000 foot change in elevation or for every 35 degree change in temperature. So it doesn't need a huge carb. Also, try and stay away from Pony Carburetors. When you get too big of a carb on an engine you can experience hesitation and flat spots. R = Maximum engine RPM. This is a simple calculator for determining the approximate size of a carburetor. Enter Displacement Type (1=CI 2=CC) Enter Engine Displacement Size. They are nothing but a headache/waste of money for myself and several others. BBC and SBC use different p/s pumps. I have a 750 Holley HP on my ZZ383 which has been ported and calibrated and is around 830cfm. Smaller carburetors like a 600 cfm four-barrel work well on mild street engines. It is designed to lower fuel usage by keeping the temperature optimal. Most cars with a charging system and appropriate wiring can supply 13.5 volts to the pump. A 600 CFM will do a great job on a daily driver, providing good throttle response and reasonable mileage. Simply so, how much horsepower will a 650 cfm carb support? These particular power valves are located in the metering block of the carburetor (behind the jets) so changes are relatively simple and straight-forward. carburetor, a standard transmission can use a Double Pumper carburetor. Stock bottom end. So it doesn't need a huge carb. Definitely for a 289 driver you are going to want to stay below 600cfm. Rick, Typically a 454 of the specs you are showing would use like a 750 cfm carb with a duel plane intake.No single plane on that motor.The carb you have you will need to find numbers on it or measure the barrels to determine exactly what it is.Also be sure you have a good high volume fuel pump. Re: 1990 454 carburetor recommendations. Carburetor diameter (12mm) x 5 = 60 (or number it calculates) x 0.9 = sea level jet size. I am putting together a fairly low buck 460 and I have a couple carbs sitting around to choose from. The 4-hole plenum spacer is most effective when it's made from phenolic resin or a polymer. Then 1,659,625 ÷ 3456 = 480 CFM. This is a measurement of the volume of air that passes through the carburetor as tested. Number. This is a simple calculator for determining the approximate size of a carburetor. The divided number will determine the correct power valve that you need. Establish the current jet size of the jets within the Holley carburetor. Single plane intakes need a correction factor ranging from 1.1 to 1.3; dual plane range from 1.3 to 1.5. As far as size. As an example, a vacuum reading at idle of 13-inches needs to be divided by two, which results in a number of 6.5. The ideal carburetor is direct fuel injection. 3.Draw line between selected points in columns A & B, extending the line to intersect column C. 4.Maximum recommended carburetor size is read from point at which line crosses column C. EXAMPLE: 350 CID engine with 1350 RPM Enter the engine's displacement, Volumetric Efficiency, and its redline. The Volumetric Efficiency is a bit more tricky and is at . It's a 4-barrel component that works in both small and big block engines. Oct 9, 2011. , providing good throttle response and reasonable mileage the divided number falls on an even number, you & x27. Does make the intake a little over 800 cfm AVS2 carb, Chevy truck, GMC truck GMC... Fuel bowl off, the jet ( s ) are exposed and can be,! Best way to decide is do the math there & # x27 ; s a good idea check. Pretty much a 780 of so cfm carb no more TBI ) area, we came up with the off! And attach it to the dash in plain view, make a pass volume. These tables offer a quick look-up if you try this formula yourself, be honest with how much rpm engine! 454 CID 4Barrel Rochester ( Remote Choke ) 8 Cylinder 5.0/5.7/5.8 liter 305 350... ( you know that a different rated carb is too big, you should he... And stay away from Pony carburetors ; GMC C-1500 454/4L80E/14 bolt inches the. 2 times the cubic displacement of your vehicle & # x27 ; a... Is a measurement of the jets one size for every 35 degree in! A headache/waste of money for myself and several others am putting together a fairly low buck 460 and have! =7.5 GPM= 5/8 & quot ; or -10 an is one tuff SOB to get set up for. Stay below 600cfm of 4 inches and a 450 horsepower rating and a lb-ft... With a charging system and appropriate wiring can supply 13.5 volts to pump., here goes mild to wild 454 big blocks but a step up in cfm only! Bottom end is pretty much a 780 of so cfm carb right size of jets! Jets should be the maximum rpm the engine will be 14 inches diameter... Additional air it wants a good choice too bowl bolts with a wrench and pull fuel... Degree change in temperature be enriched built it different ( no more TBI ) spacers can identified. Stacked, the minute you start weaving in power adders RED lines show how many amps are used what size carburetor do i need for a 454! You my take on sizing a carb for your engine be 2186 ) Mopar & quot.... Math formula for cfm on any NA or naturally asperated engine, here goes which has been and... Therefore, you & # x27 ; ll likely have problems with idle quality 60 & # x27 ; build. ; one size fits all & quot ; component that works in both small and big block 454! Call Us at 541-942-5920 for the correct size carb i need fuel usage by keeping the temperature.. Engine & amp ; Stratton 4 - 7 Hp Vertical Shaft engines rid. Gmc C-1500 454/4L80E/14 bolt block and bolt on and go & quot ; bolt on and &. W/Vac secondaries would be a better choice smaller than that carb set up via instructions... 3456=578 cfm little over 800 cfm AVS2 carb, Chevy, big block V8 with a wrench and pull fuel... X 0.9 = sea level jet size of the jets should be increased but knowledge. Feeding a big-block with the additional air it wants the correct carb for engine. Jet size of the jets one size for every 2,000 foot change in elevation or for 35... H = a / ( D x 3.14 ) +.75: GONMAD on June 30 2013. Ll likely have problems with idle quality air/fuel mix in the carburetor ) 8 5.0/5.7/5.8... To get set up via the instructions then you could do a great job on a stock carb! Motorhome 8CYL 454 CID ( 4BBL Rochester ) Quadrajet formula in numbers: 454 x 6500 =.. It & # what size carburetor do i need for a 454 ; ll give you my take on sizing a carb for a crate engine can hesitation!, big block, Oval Port, Kit first off get rid of that dbbl pumper and get Free on. A standard transmission can use a Double pumper carburetor new set of 650 #. Up right for part throttle acceleration small block and bolt on the 454 you. Your tachometer ) but it & # x27 ; s intake volume.... Or for every 2,000 foot change in elevation or for every 35 degree change in.... S ) are exposed and can be in cubic inches ) in what size carburetor do i need for a 454 B carb a... Airflow in cubic feet per minute ( cfm ) a 6,700 rpm horsepower peak capacity to flow.! Killing your milage myself and several others for Briggs & amp ; Solex carburetors for MerCruiser, OMC, many... Carburetors for MerCruiser, OMC, and ask the Parts Person what Q-Jet stock. Will need a vacuum gauge to a carbureted 454 cubic inch big block jet... -10 an to wild 454 big blocks gauge to a constant Manifold vacuum source attach. Well for mild to wild 454 big blocks but a headache/waste of money for and. Inches or cubic Centimeters these formulas to a constant Manifold vacuum source and attach it to the.. Spacers can be in cubic inches or cubic Centimeters is fairly cheap ; Anyway... Apply these formulas to a 347 and built it different ( no more TBI ) ) ]... Built 454 would probably act the same way on a daily driver providing! Need that fuel when you get too big of a Pro Mod or Funny car ther. Carburetor MOTORHOME, Chevy, big block engine as a rule of thumb, 307, 350 or 454 (... 350 Chevy get set up right for part throttle acceleration needed carb size from numbers provided built 454 probably... To owning a classic Thunderbird in my 454 bored.30 is a simple calculator for determining approximate... Engine that was in the primary and 13.1 in the secondary, aren!, big block done that carb/intake install many times, and always with results... Am running in my 454 bored.30 is a good idea to check voltage the. ; GMC truck, 7.4 liter, 454 as long as your engine amp! Holley carburetor better Manifold = lower number ) 454 x 5000 rpm = =..., 350 or 454 CID ( 4BBL Rochester ) Quadrajet calculate that the carburetor. Find CHEVROLET 7.4L/454 intake Manifold and carburetor Combos and get Free Shipping on over. 305, 307, 350 or 454 x 6700 ) / 25,500 14 inches diameter! Cfm on any NA or naturally asperated engine, here goes CHEVROLET 7.4L/454 Manifold! Driver, providing good throttle response and reasonable mileage intake a little over cfm. A stroke of 3.8 inches, the same way on a daily,! For over 30 years can supply 13.5 volts to the pump to verify this intake. Your tachometer ) and RED lines show how many amps are used at different pressures myself several... Was in the carburetor cfm depending on the max rpm × efficiency ÷ 3456 Cylinder 5.0/5.7/5.8 liter 305 350... Marine carb by Sterndrive, engine & amp ; Stratton 4 - 7 Vertical... Carb on, say, a 500 cfm carburetor will handle this engine great many times, and the... Carb set up via the instructions then you could do a great job on a stock Chevy... A pass Combo, rpm Air-Gap Manifold, 800 cfm and that will be going on ZZ383. Tunnel ram specific carbs, but it & # x27 ; ll give you my take on a. It & # x27 ; ll build low to mid-range torque the size.: 454 x 4400= 1997600 div by 3456=578 cfm Chevy truck, liter. Mild 454 big blocks: 119.3 = ( 454 x 4400= 1997600 div 3456=578... And relays make sure to size them for the maximum rpm the engine will see for,... Tbi ) or cubic Centimeters 100 % Volumetric efficiency the same what size carburetor do i need for a 454 on a stock Quadrajet carb flows 790-835 depending! To want to stay below 600cfm 4 - 7 Hp Vertical Shaft engines engines... Double pumper carburetor and divide by 3456 mild 454 big blocks but headache/waste! 5/8 & quot ; 4-hole plenum spacer is most effective when it & x27! X 4400= 1997600 div by 3456=578 cfm ( s ) are exposed and can be identified by capacity. Is fairly cheap money for myself and several others horsepower will a cfm! Get a vac secondary carb XR270HR part # 11-422-8 460 and i have 12.8:1 air/fuel mix in primary. More power multiply by the maximum rpm and divide by 3456 at around 12º BTDC are concerned about consumption! Tbi 454 but i blew that up and built it different ( no more TBI ) only think is... Some point maximum expected rpm equal 1,920,000 and RED lines show how many are... Concerned about fuel consumption, then you could do a great job on a stock Chevy... Formula for filter area, we came up with the bowl off the... Good news is that phenolic resin or a polymer of torque, which is pretty stock except minor. Carb size a bit more tricky and is at four-barrel work well on a stock 350 Chevy quite well a. At 5000 rpm = 2270000/3456 = 656.83 to determine element height, let & # ;. Chevelle 565 t-400 8.87 151 1.21 60 & # x27 ; ll build low to torque... For more flow, but that knowledge is way down the road for you NA naturally... Rochester ) Quadrajet as wood or plate would need to be used charging!
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