I starting a 383 build for a bud and I’m having trouble finding the right piston to get decent compression ratio. He did not check anything when he built the motor that lasted about an hour before it failed, so I’m taking over. It had a sad 7.4 CR with a 1.908 C.H. and deck height of -.068. Cast pistons are 1.848 and even lower CR. Speed pro forged are better at 1.920 and gives me 7.85. I was thinking that the oem pistons for the Hp 383 for 68-70 was a positive deck height. I’m not sure that C.H. is listed in the service manual. Anyone have a better source of pistons besides KB? They were in his first motor build and failed. They had a 7.42 CR. They are not an option for me. Thanks.
Btw. Custom pistons are not an option budget wise for him.