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#1
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Which Carburetor CFM is Right for Me?
Hi All,
I'm getting a 340 to put in my 65 Barracuda and I'm looking for the right carb for my setup. My specs are as follows: Edelbrock LD4B Intake Manifold (Holley; 180°; #283613) Cam - 292/480 (I think) X Heads - no port/polish work. Spitfire A-body Headers Assume stock pistons/compression ratio Given this setup (anything else you need?), what CFM carb should I be using? Any particular brand you'd recommend? Thanks for your responses! Morga |
#2
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What are you using the car for?? racing?? or street?? for the street driver i would go with a 650 vac sec holley, even a 600 holley would work great ... if it's a race type car with gears and convertor you could use a 700 or 750 holley .... edelbrocks 600 work great also a street car .....
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#3
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It'll be a street car, with an occasional trip to the track.
Thanks for the reply! I'll look around for some of those. Any other suggestions? Morgan |
#4
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Car Math
Check out this site, it should help you out: http://www.prestage.com/carmath/
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#5
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My opinion is, take the motor and have it dyno'd. I don't know what places charge in different areas, but here it is $200 for 4 hours. Best money spent. The guy has his small wall of carbs in plastic containers and we kept using them until we found the right combo. Dial in the timing, lock down the dist., drop the motor in the car, bolt on what ever carb you found worked best and go. Takes all the guess work out. You also have the other, inherit benefits. The guy running the show is a tuning expert (in my case, he has over 70,000 pulls), breaking the motor in on the dyno is the way to go, you can find any leaks that may exist before putting the motor in the car. A couple of hundred dollars I think should be included in any build budget.
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#6
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Mainly a street car I would suggest the Carter AFB 625 #9636 with a 1" 4 hole spacer. Excellent throttle response and easy to tune. Almost right on out of the box and you can fine tune with a strip kit or just a couple of different metering rods and the spring kit. I'm too lazy to play with a Holley to get it to run right.
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#7
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Bigger Carb
I know I am going to get in trouble for this but I say go with a bigger carb. I owned a 1970 Satelite with 318, and I added a good set of headers and an Intake off a 70 Duster and a Carter 750 cfm carb, and it worked great at W.O.T. Some of the 340s came from the factory with 800 cfm Thermoquads, like the 73 Duster. I drove that Sattelite for six years without any problems, except for guys in cars with flashing lights. The 340 heads are good breathers and can handle a 750 with no problems.
Quick Claims Adjuster!!! |
#8
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holley 3310 (750 vac) it's easy to tune & cheap.
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