I did a search couldn't come up with a definative answer. I am trying to get my Compression ratio to 11:1. By my calculations I need 62cc chambered heads. I have a stock 98 bottom end and hand ported 806 heads with no valve work, and I plan on using a .04 cosmetic gasket. My question is how much do I have to mill my heads, I was told I need to take off .030 but I want someone with more experience to confirm this.

Thanks in advance for any help.

 

It's generally accepted that milling .006 off a LSx head will remove one cc from the chamber.

 

Great thats the info I needed thanks