[Skools Out]

Flat tops are loopers and it should be a 3.500" bore motor. If you have to bore it just bore to a big bore piston. works out great. I've got an 85 i bored to a 1988 up big bore 3.6875" just have to use 1988 up head gaskets.. it basically makes your motor a late model power head. They oiled better than the old 3.500 did. Have you opened the block yet? I have one torn all the way down right now. It's an 1988 Evinrude 140. Has a cracked sleeve. ???