The valves are 2.30 and the cam is a .660/.666 solid roller comp cam and the piston are a 2456 speed pro LS6 or LS7 piston I cant remember. I asked the motor guy he said compression is over 12.1 but I talked with other people and they said only around 11.5 to 11.7. The heads were cut and the block has a .010 deck to piston clearance. Its a street car that I hope to run 10.5 or quicker . It has a four link so If I get it to hook and put the car on a diet I think i can get there. thanks