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Old 05-31-2010, 07:28 AM
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Intake Manifolds & Carbs

My 461 BBC has an Edelbrock Victor Jr. 454-O intake has the 4500 carb flange with an 1150 Dominator sitting on top. Many of you have suggested that I go with a smaller carb (750 - 800cfm) to help gain performance. This is a drag race application only, no street. I have a newly rebuilt 750 DP Holley sitting on my BBC 396 drag boat that I was thinking of swapping out just to give it a try instead of buying another carb right now. Of course the 750 is a 4150 flange. My question is, do you think I need to change the intake from a 4500 to 4150 or just use an adapter? I know it's better to keep everything matched but was wondering if using an adapter instead of buying another intake will give me the same results.

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Old 05-31-2010, 09:00 AM
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Get a adapter for it.
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Old 05-31-2010, 09:49 AM
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I don't think going to a smaller carb is going to help you at all if this is the engine you have posted about before in the S-10 race truck. Especially so if you have enough converter stall, 4000 or more.

It migh thelp if you don't have the Dominator tuned correctly, but if thre Dom is correct it's design w/annular boosters is superior to the 750 4150 flange with dogleg boosters.
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Old 05-31-2010, 10:32 AM
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The reason I was asking is that I gave my build specs to Hughes so they could size a converter for me. They said that the 1150 is way too big for my 461 and they recommended no larger than an 800cfm 4150 flange carb. Now I'm really confused
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Old 05-31-2010, 11:13 AM
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What are the specific's on the converter they spec'd for you??
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Old 05-31-2010, 03:49 PM
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The 750 might run better than the 1150, but that's NOT to say the 1150 couldn't be tuned to run better than any 750 in your drag-only S-10.

If it were me, I'd concentrate my time and energy on correcting any problems w/the 1150 and then tune it to work with your engine and vehicle combination.

Obviously, there's more to it than just the carb. Ignition, gearing, TC stall, chassis/suspension set-up all play into it, but you already know this- I only mention it in passing.

Good luck.
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