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Old 09-02-2002, 07:22 PM
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I have a 454 chevy engine, it has been bored 30 over, it has forged flat top pistons,comp cam(280h),oval port closed chamber heads(110cc)no carb yet but I am looking for the right size. My question is with this set up how much torque and horsepower could I get out of this combo? I plan on using it for the street maybe taking it to the track on ocassion. Also what size carb do I use?
Holley or Edelbrock?

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Old 09-02-2002, 09:18 PM
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850 Holley double pumper. No excuses the best available. An 1150 Dominator is best but needs a special manifold and costs a fortune...if you can find one. Don't let anyone talk you into a smaller carb for that engine, you need the capacity for optimum performance. I estimate 475-525 HP with the right manifold and header/exhaust combo.
“She may not look like much, but she's got it where it counts, kid. I've made a lot of special modifications myself.”

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Old 09-03-2002, 01:08 AM
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A Holly 850-double pumper is a nice choice if you plan on stopping at every gas station you pass for gas. I think it pumps about 5-cc's per pump stock!

I would use the same cfm rating and opt for a spread bore carb if I drove the car on the street. The primarys can be set up for a lean mixture and the fast air flow through the small venturi vaporizes the fuel/air mixture for even distribution and good throttle response.

Research the Carters and Q-Jets ... large Q-jets flow 800-cfm. And are just as easy to set up as a Holly. Large GM big block motors 71-79 usually had the big Q-Jets.

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Old 09-03-2002, 07:06 AM
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If you go the QJ route, make sure that you do not overtighten the front bolts! it will warp the top cover and screw up the idle by allowing minute air leaks near the center. This has hosed me a couple of times when I tried to hurry getting a QJ right. One advantage I've found with the QJ is that if you get it right, they work well without the constant diddling around that seems too common with Holleys.
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