383 turbo build??
02-02-2009, 12:05 AM
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383 turbo build?? wanted to know if a 383 sbc with afr 225 heads,truck maifold,not sure which cam would be suitable for this hoped you guys could help me out with that, and a 91mm...how do you think this setup would hold up and around how much power it would make
02-02-2009, 04:38 AM
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my setup is 383 ls1 with 91mm baby cam and afr 205 heads through 9" rear 4l80e trans and my setup made over 900rwhp.If u pick your cam right u should be over 1000rwhp
02-02-2009, 02:55 PM
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sweet i wasnt quite sure if it would hold the power or not but that sounds like an awesome setup 98transguy has pretty much the exact setup i was thinkin..wat kind of manifold do you have, i was thinkin about the truck manifold
02-02-2009, 05:14 PM
#6
With forced induction, like without, I think people often make the mistake of going with cams that are too big. I think cams for F/I should have low overlap and at least 10° more exhaust duration than intake. For the record, Lingenfelter uses or used the GT-7 cam for their 427TT builds. The specs of that cam are not what you would think for such a large motor. 208/230 .554"/.546" 121° LSA
02-02-2009, 05:18 PM
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Not sure how it works in the lsx world but majority of the turbo grinds i've seen for small blocks are single patterns or have small degree split, 4-6 degrees max. some are reverse split if dealing with log manifolds or such. With tubular you dont usually have a reverse split, its mainly a split pattern. LSA is generally 112-115 depending. Lsx cams i've seen typically run 112-114 as is for n/a so abit wider wouldnt hurt for forced induction. You dont really need or want a bunch of overlap unless your trying to turn some rpm, then you will have to sacrifice some low end performance *bleed off boost* for some higher rpm gains
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02-05-2009, 08:36 AM
#10
I am currently building a 383 LT4, Yes agreed that turbo motors do not need a lot of camshaft, BUT it all depends what you want, low duration cams like a 218/218 will give you redlight to redlight response but will peak very early in the RPM band, when I was supercharged my cam was 236/244 on a 112, I am now going with a custom grind. Remember LT1's and LS1's are different beast, A large cam in an LS1 will be tame in a LT1. Give Kenny Dutwieller a call, he has been building Turbo cars for the last 30+ years..
