ok i have this extra set on heads

part # 928.104.346.1r
what i wanna know is....
what year did these come from?
should i have bigger valves put in.....i kind of plan on porting them out...will the valves be big enough to do me any good if i do port the heads
what would you do with them????

power is made in the heads.....so my thinking is make it breathe better=mo power


thanks for your input
p

 

Well, I've looked over the PET and that doesn't show as a head number. Maybe a casting number but the heads are like 928 104 0XX. "928 104" does indicate head parts.

 

thats the # on the heads?????
got me glen