Well I went and got the Casting Numbers off of the heads. 186, is the number. According to the link you posted, Jerry, the 186's were "Later hi-perf or “fuelie” heads," And something in me likes the sound of that. ha ha. But the markings are still strange. I tried to get the serial numbers, but it was getting dark and what with oils and dirt and whatnot on the motor I didn't bother too heavily with gettin 'em.
