Kenny, The heads have the # 526117-3 on them. The pad (which is on the left side about in the middle) on the block has # P3 87152. She runs ok (leaks a little). But, as I originally stated. I'd like to find an owners / service manual or something just incase I ever decide to rebuild it. Also, it would be nice to know plug gap, timing,, c.i.d. etc, etc. Thanks, Lance