JeaneGrae

iTrader: (7)

Trying to build a 383, what top end components such as heads, intake and tb would be get me 425 rwhp.

cdubbzz

iTrader: (11)

Livernois Stage III's, FAST92 (ported by Mamo) and NW throttle body.

my .02

SOMbitch

iTrader: (8)

425 is easy on 383. I almost make that on 346ci stock bottom. Raise the bar. I have a friend making 47x and running upper 10's with TSP 5'3's, unported Fast 90/90, and MS4. Don't know for sure but think he is milled to 59cc and pistons have 4cc valve relief. I'll ask tomorrow

scidav87

iTrader: (16)

i'd be shootin for about 490rwhp or so, the stock 346ls1 with h/c is an easy 425rwhp. See what Texas speed, and other good shops have to say...

99blancoSS

iTrader: (115)

You can acheive your goals very easily, a 383 is capable of more power than that.

Some heads and a mild cam and your where you want to be. I would look for used cnc'ed ls6 heads and save some money.

Black Sunshine/ 00SS

iTrader: (1)

Hands down, 205 AFR, Mamo ported 90 (92), Should net you around 430-450, depending on how radical the cam.