The guy probably paid what he felt was a lot of money for porting on his heads a long time ago(evidenced by all the carbon build up). The heads probably had someones stage 1 porting on them and the guy just remembered all the $$ he spent on valves, resurface, stage 1 porting and years down the road thought he would get some eddys and sell the old max ported heads

Sorry, I am an optimist

I am not causing global warming, I am just trying to hold off a impending Ice Age!