Comp. ratio and head questions
Thread Starter
Joined: Sep 2005
Posts: 8,139
Likes: 10
From: Chillicothe/Lima, Ohio
Comp. ratio and head questions 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?
Thread Starter
Joined: Sep 2005
Posts: 8,139
Likes: 10
From: Chillicothe/Lima, Ohio
Originally Posted by PREDATOR-Z
If you go to 10.5 SCR then 228/232, .588/.595 110+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
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
