While changing my valve cover gasket, I decided to write down my engine S/N this time. After researching my FSM, I came up with nothing that matches what it says the number should be laid out. Help me out if you can. S/N 4FR185061. I have checked and that's the number. It's the first digit that gets me. Got the number off the top of the block under the thermo housing. :hurrican: Oh yeah It's in a '56 CJ5, F4-134.