1950-54 Pan Cyl. Heads. These were on my Duo-Glide until I replaced them with remanufactured ones. No Cracks. Rare for a set of Pan heads notorious for cracking at the spark plug or between the valves. There's at least two or three D-ring holes that are worn-out. The head needs remanufacturing though they ran the motor well when they were removed. Spark plug holes have good threads. Valve seats are good. The heads were converted to 0-ring conversion intake ports. They are tight and do not leak. The motor was so well timed and air-tight, that if the ignition was ON, and you walked by and blew on it, the motor would start. Ships USPS to the lower 48.