lol yall are missing this fact he isnt doing the work himself. if a shop put the belt on just to find out whats going on with the head he has to pay for the R&R plus parts. an if it turns out to be bad now he has to pay to do it all over again plus pull the head. me personally id just pull the cam do a comp test call it a day. just remember your looking for any compression not max compression. 30-45 minutes tops on labor vs. 4.2 for belt then another 7.8 for r&r of the head. now thats alot of money and time for a simple diag.