July 28, 2008 at 5:00 PM #1 http://cgi.ebay.com/ebaymotors/ws/…em=270259932416Auction claims C8ZE-B castings with 3M20 date codes. This is an over the counter pair of heads. Would this be Dec 20th 1973 date code?????Guy claims date code is definately 3M20 and not 8M20.
July 28, 2008 at 7:01 PM #2 hipo service replacement heads were made well into the 70s. 3M would definitely be Dec 1973.