I believe there is Spridget tuning book that has photos of all the in-line 1275cc Blocks in it?? Somebody else. In a message dated 02/10/2009 23:39:04 GMT Daylight Time, soavero at yahoo.com writes: It'd be a 12CC block. Not all 12CCs are thin, but all thins are 12CC. Take a picture where the pan meets the block and email it to me.