I recently picked up my rods n pistons for my build but the buddy I bought them from said he wasn't sure what cc the pistons are. Theyre Ross Racing pistons .020 over, so I got on their website and see they only have 2 different cc pistons, 0 and -16. Mine are dished so I have to have the -16cc ones. What I'm getting at is what kind of compression ratio would these give with 99 cobra heads? I wanna say 9:1 but I'm not 100% sure if thats right. Can anyone help me out?