Ok, I just ordered a Katech Torquer for my Z06. I'm going to order the heads in the morning from TSP (PRC LS7's). Should I mill these bad boys or leave them alone?

 

mill mill mill.....from the avitar i take it your rfom florida

 

Gainesville!!! But living in Phoenix now.

 

ever heard of raymac motors

 

thier top porter chris frank just opened his own shop and he has a website i'm lookin for it right now so you can look into it

 

No I haven't, I appreciate it.

 

Katech says DON'T. The torquer cam takes the dynamic compression ratio from 8.5 (stock LS7) to 9.1:1.

 

Awesome, thanks.

 

i'd leave the heads alone. if you want more compression, i'd personally just run thinner head gaskets. milling the heads is permanent and that would bother me, especially if it didn't work out like you wanted.

 

how do you figure dynamic compression?

 

It ain't easy:

http://www.wallaceracing.com/dynamic-cr.php

 

hey i was told if you take more then .010" off your head you need to have the intake milled also. is this true?

so like gm designs heads/intake around a .051 head gaskets. so if i go to a .040 head gasket do i need to mill intake?

if so this will get gay real quick

 

changing the head gasket to a .040 will not cause you to need to mill the intake. by changing it by .011, you're only shrinking your stock gap between the intake/heads by about .007 on each side, which is only about 2 sheets of normal copy paper. the intake o-ring gaskets will more than compensate for that minimal change.

 

I had my LS7 heads milled .030", using stock GM head gaskets, intake fits fine, no changes. I did use shorter pushrods.