A few changes to 540 hp carcraft buildup... what kind of hp loss? guesstimates please - Page 2 - Hot Rod Forum : Hotrodders Bulletin Board
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Old 07-31-2003, 03:20 PM
WV hillbilly

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Originally posted by Super Streeter
First off,a real 540 hp is a tall order out of a 383 or even 406 on the street.Westech's dyno is a bit optimistic,so figure that you are looking at that engine being a real world 500 hp combo.The combo of a small carb and dual plane is a disaster.The split plenum of the dual plane needs more carb then a single plane,a lot more.In reality,that engine combo needs to spin 6500 rpm of even a bit more to make an honest 500 hp.I would want at least 800 cfm on that combo,even maybe a 950 hp carb.that combo should work best with at least 4000 stall and 4.56 or more gears.It isnt a very streetable combo for everyday use.I would run it with a gasket matched Victor JR or Strip Dominator,and an out of the box 850 double pumper with the correct jetting.I would also run at least 1 3/4 primary pipes and 3" exhaust.Good luck.
you know that is a good point, I found the best carb for my 355 is a 800 dp, The intake is a portmatched weiand stealth intake with a spacer and I have no problems and it runs great...

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  #17 (permalink)  
Old 08-07-2003, 07:54 PM
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I'll be playing around with carbs until the cows come in, but that's a little easier of a swap to play with than headers.
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