I need help on estimating the CR my car would have after this, I beleive the cometic gasket I have is lowering my CR but I haven't found any other in 81.5mm
I have Arias High Compression Pistons which claim to raise to 11.3:1 in some websites, and 11.5:1 in some other website. That would be on a stock gasket I supose, which is about 0.7mm,(0.0275"). My gasket is a cometic with 0.030" thickness, I think I might be loosing something like 0.1 of the Compression Ratio, but ok thats not the problem right now.

The problem is I'm getting some flat faced valves, which should raise about 0.2 or 0.3, right? And I think I will have once more the cometic head gasket in 0.030" thickness, so the question is;

How much should I mill the head to have a 12.0:1 CR? having the following setup:

Arias High compression Pistons
Omni Flat Faced Valves
COMETIC 0.030" head gasket.

My guess so far is that milling 0.010" won't make it, I think it might get somewhere between 11.6-11.8, depends on the arias pistons info.

Thanks.

 

http://www.zealautowerks.com

 

thanks for the link, however I had to estimate the CR increase due to the flat faced valves,
that would decrease the combustion chamber volume in something aroung 0.7 CCs, right?