Aluminum Head Feedback

I have a set I bought bare and had built for my engine. My only complaint is the valve cover rail on mine were too short. I needed 3/8" spacers for the valve covers to clear the intake even after grinding down all the bosses that typically get in the way plus more material. Could have just been my set, mine are probably 8-9 years old now. My dad has used SBF and SBChubby Procomp/Speed Master heads for friends builds and they have been fine too, but they were all bought bare and built.

If you buy a assembled set disassemble them and go over them or have a shop do it.