According to the serial number my engine is a 1986 OMC 2.5L it is installed in a 1987 Starcraft Islander. I have spent a lot of time searching for a 1987 repair manual thinking that their may have been changes in the out drive in 87. One of the 86 manuals that I found has a photo on the cover of a stringer drive. My boat has a Cobra drive. I don’t really need 2 manuals do I.