I'm taking my 243's to a machine shop to get milled .030 Thursday and the I've had more than one machinist tell me that with .030 cut from the heads, the intake and valley cover will not fit because the angle of the manifold bolts change. They're going on an 01 LS1. Any truth to this???

 

U will be fine with .030" milled. Mine were milled .035" i had no issues with the intake bolts not lining up.

 

That's what I wanted to hear! Thank you so much buddy!

 

I had .020's taken off and had no issues.

 

I'm at .030 on my 243s on my 6.0 no problems hear

 

.040 cut off mine no issue

 

Thanks so much guys! I'm having them done for $43/ea.

 

Any idea of what compression these will yield? 2001 LS1 stock bottom end.

 

Around 10.8 to 1 maybe higher

 

Awesome, thanks. I was hoping for 10.8-11.0:1