Does anybody know if there is a difference between the head 346236 and 14092360? I know their peanut ports but is there any difference between them, I already had our engine rebuilt and they did not spot the crack on one of our heads. Now the machine shop says he cant find another head to rebuild. I went on CL and found a pair for $50, ours are the 346236 and the pair I am interested in is 14092360. Now I know these are not the demanding heads but we already have one rebuilt and still on the motor.