Hi,<br /> I have the above engines both fitted making it incredibly awkward to find the serial numbers the only two numbers identifiable are OC649870 and OC 545197 transom serial number and drive unit serial number. On the flame arrestor cover it states "thunderbolt ignition power steering alpha one". The boat is 1988 does any body know the correct Clymer manual to get?<br />Cheers in advance Bob