I found a 1978 Evinrude 150 that is missing the lower unit but everything else is intact that I can pick up cheap.Will the power head and exhaust adapter work on my 1989 xp150 lower unit and mid section?
Will the electronics from the 1989 work on the 1978. I need a winter time project to play with. I already have a set of the good heads 320643 & 320644 & 1 3/8 carbs. My 1989 is complete and runs but one of the liners have a small crack from an overheat and needs replaced. In stead of sinking a lot of money by putting a sleeve in the 1989, I thought this may be the way to go. I think the 1978 has a bubble back exhaust. Would I be better to build the 1978 for more horsepower or my 1989. My 1989 has had the exhaust ports lowered and widened. Could the 1978 be ported out to close to the 235 spec. It is on a bassboat. My 1989 will push my Charger at 5900 rpm's to 62mph gps, with a tournament load with a 22 inch Raker. I was thinking the 1978 may have more overall horsepower potential. Any thoughts?