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Aug 10, 2007 | 07:34 PM

65f100_352

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Carb questions

What would be a good carb choice for a 78 F250 with a 460 that wont bog out? I have thought about the autolite 4300.

Aug 11, 2007 | 06:45 AM

LxMan1

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That may be ok, I used the Edelbrock on mine.

Aug 13, 2007 | 03:28 AM

65f100_352

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did it bog out any?

Aug 13, 2007 | 07:40 AM

LxMan1

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From: Louisville,Ky.

Nope, no problems. I ran the 750 on mine. I had a mild cam, headers, true duals and a Performer intake. It also runs well with a 600 Holley.

Last edited by LxMan1; Aug 13, 2007 at 07:45 AM.

Aug 15, 2007 | 12:20 AM

Critter183

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Been a while since I played with carbs but the biggest reason for bogging out as you put it is too much carb for the engine.

There's a formula for calculating required carb CFM.

CFM = Displacement (in cubic inches) X Maximum RPM / 3,456

302 CI X 6000 RPM = 1,812,000 / 3,456 = 524 CFM.

Just go up to the closest available size and you're there.

Aug 17, 2007 | 03:29 AM

65f100_352

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Ok, I meant choke out from a steep angle instead of bog. I like going up some pretty steep stuff, and i dont want my truck to choke out in the middle of a hill. BTW, has anyone use a carter thermoquad off road?

Aug 17, 2007 | 12:40 PM

kermmydog

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From: Western Central NV

Quote:

Originally Posted by 65f100_352

Yes, on an 85 W250 Dodge 318. There's not any different than a Q-Jet off-road. The problem is finding a good Thermo-Quad, and getting it set up. With plastic bowls they had there problems. Many Dodge guys go to Q-Jets. If you check out the forum at allpar.com you'll find a good group of Dodge people if you search there is a lot on Thermo-Quads there, & where to buy good ones. Holley builds the Truck Avenger that is designed for what you want. 45 degree side angle Holley claims NO PROBLEM. Spring loaded needle & seat. Never used one. I run a 600 CFM 4160 Holley on my 86 F250, 4x4, 460.

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Aug 19, 2007 | 08:08 PM

65f100_352

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Id love to use a truck avenger, but i dont have the money for one. Back to my original question, would a 4300 do ok off road, going up steep stuff and mudding?