stock crowns are flat arent they? been a while since I had a head off one. supposed spec is low comp stage 3 head running piper t2 cam. as it stands I've only got the inlet manifold off cuz I gave it a lick of paint but after reading about the said engine builder I'm in two minds whether to strip it down snd check. was running ok with no noises. suppose a good place to start would be checking port work. I'll see how I'm fixed for time and might whip the head off. busy with sunroof cassette's and under side clean ups at the minute.