Aluminum vs Iron compression on pump gas

you'll be in the 550+/- range if you can pick up port volume.jmo

More lift would be nice if you are gonna run a flat tappet and achieve 600.jmo

An actual 'after lash' .588 '+' lift is what I expect to see in a 600 hp 4''arm build.
11.1+ comp too.

sounds good though, have fun!