Geez I'm so over this cam chain thing. Have spent hours trying to fit a new cam chain to my 447 engine - the new chain says "FTS219", while the old chain is marked as "DID219FT". Supplier tells me I have the right chain, they have the same number of links. But when trying to fit the new chain is a link too short, while the old one fits perfectly. I was only replacing the cam chain as I was doing my first rebuild with pistons etc. some have talked about two different chains with different pitches, others suggested tightening the head gaskets to make it fit, and others suggested heating the new chain up so it might stretch enough - I caan't see how I can do that with the bloody thing threaded through. So I have now decided to put the old chain back in and work this out later.