Share your Pro Comp head knowledge

Procomp sell them as bare heads in both unported and full CNC Ported form the difference is like a 300 bucks a head , either way you need to replace the guides and get a good valve job and check the spring perches , all things you should at least be checking before assembling any head .

PS the term "as they should " is pretty subjective in this context , is the as cast how they should perform as a baseline ? or is the full CNC port the baseline , porting is always for power , there really isn't any other reason to mess with a bare casting beyond cleaning off the casting flash .