garygnu

whats your budget ?get a second job .it probably cost you $10,000 to make 450-475rwhp with a stock cube ls1 ,and you will need a better rear end and a built tranny .get some after market ported heads .check out air flow research ,trick flow ,or Texas Speed PRC heads.you will need a fast 92/102 intake,and a matching TB.you will need to talk to a cam guy ,to spec a cam to work with your whole combo.you will need 1 3/4 or bigger headers ,and a great flowing exhaust system.you will need bigger injectors ,and a good tuner.

Fry_

This 20 page thread might make your head hurt but is should help answer your questions.
The "recipe" to 500 rwhp with heads and cam.

Roarin_8

iTrader: (5)

Why 550rwhp? What kind of trap speed do you want in the 1/4? 550rwhp will trap over 130mph in the 1/4 with these Fbodies fyi.