340 compression test

Stock 1970 10.2:1 340 w mopar .284/.484 cam is running 150-155psi. Domed pistons are not stock and would be higher then 10.5:1 Mabe you need a cam w/ more duration and or thicker head gaskets to lower your cylinder pressure. 220 is aweful high. If you figure out your static compression mabe you can get a cam to get your dynamic compression down where you need it, depending on how much of a dome you have.