bww3588

iTrader: (49)

i have a 98 Z28 M6 and will be looking to do a H/C/I swap in the near future. i want to stay with my stock heads but want to have them worked. I also want to still make it streetable. so what is the best comp ratio to go with and still be on pump gas. also can i get this number with my stock heads planed down and not screw with the pistons?

PREDATOR-Z

It all depends on the size of the cam you wish to run. On average 11.0>11.2:1 is what LS1 motors seem to like on pump fuel.

bww3588

iTrader: (49)

i just want a mid range street/strip cam. nothing wild nothing mild.

PREDATOR-Z

If you go to 10.5 SCR then 228/232, .588/.595 110+2

bww3588

iTrader: (49)

10.5 is stock, so should i just pull the heads and have them worked over? should i put bigger valves in them? obviously ill need longer pushrods, and new lifters, can i use the stock rockers or should i step up to 1.75's or 1.8's? should i port the heads? will my stock intake be sufficient or should i upgrade that as well. also i have a 98 so will my bottom end be strong enough?

AINT SKEERED

iTrader: (2)

On a ls6 10.5 is stock. on a ls1 10.2 is stock.

Stay with stock rocker arm's though. You may lose power from valve float with the aftermarket rockers.

The cam that predator-z speced out will work but so will something like a f13. My heads are factory ls1 241 casstings with very little porting but bigger valves and only milled .015 with stock gaskets . should be around 10.5.


I would mill about .015-.020 but use a thinner gasket to get the quinch in the .032-.039 range. go with a .041 gasket