ok i have pr3s in a ls vtec using a gsr head(hasnt been milled) and a cometic 3 layer head gasket the online compression calculator is claiming that setup is good for about 12.3:1 but it seems a lil high to me.... anybody know if thats right?

 

theres plenty of online compression calculators...if you dont trust it go to another one.....they usually are accurate

 

http://www.zealautowerks.com gives me about 11.4:1