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I know..another what if question. I bought Robz's Cartek 4X heads, and installing them this next week along with a Fast Setup, Injectors, Lifters, etc.
What kind of numbers do you think I will put down with the new parts?
My current setup was:
Stock 853 Heads with upgraded valve springs
230/228 .612/.595 110-1
LS6 Intake and Ported TB
Underdrive Pulley
Long Tube Headers
Random Tech Hi-Flo Cats
Borla XR-1
I have similar mods. 440-450 rwhp. I have a ported FAST90 and ported 90mm TB. I ported it my self and I also stepped up to 42lb/hr injectors. LS2 timing chain, Melling oil pump, Patriot Stage II heads, Caddy Racing Lifters, Whiplash cam, comp push rods, and a new self tune.
If you have the provisions for the timing chain damper, find one and install it.
Some recommendations:
Purchase:
Powerbond pulley
Pin it to the crank
ARP damper bolt
ARP Head Studs
MAP relocation Kit
Don't know what clutch you have but this MOD obliterated my stock ZO6 clutch on the first full speed flogging!!!! Purchased a SPEC Duel Disk for the up grade