I picked this era up a couple years ago ,some may remember as it was advertised here.
I have learned some cammer trivia ,that reproduction heads have external
oil returns exposed at the rear of the head and aluminum.the original cammer heads were cast iron and
drain back was internal ,a unknown few were aluminun and never sold only promoted to sponsered racers . this cammer is one of the few aluminum head original,came from randal richie of les richie fame performance assoc.