I'm in the middle of a little ls v project, I had bought a head and later on got some type r cams, I was told that i would need pistons with around 11:1 compression to push them. So *** it I found some je for 300 but was told that it would have to be sent to the machine shop. Can I jus throw some type r pistons in the ls block as is? I plan on sprayin too, nuthin major around 55 shot,......makes a difference?