Head Porting basics

I'm planning on running a Comp Cams 507/510 lift that I can't remember the duration of right now, I think 24X. I'm not real sure what the max lift is for X heads, but I think I'm alright with this cam. Not sure tho.

sounds good! good luck with the porting...i would like to upgrade my cam sometime in the near future to something in the 530ish lift range, but im not sure if the x heads, even properly prepped will handle it as im not sure what the max lift they can take is...anybody?