1973 Browning Marine
Regular Contributor
zackie77, My thoughts are that the boat originally had a 3.7l (470). It may have blown up and the guy found another engine but was an earlier version. I think a 1982 470 should have an iron log style exaust manifold. He may have taken parts from the later style engine and swapped parts. They are all the same, horsepower was increased or decreased by either four barrel or two barrel carb. Internals should be almost identical except for maybe flattop pistons vs. notched. Anyway, what I am trying to say is they are all 470 blocks just alot of crazy names from I think 1974 til 1989. Merc. put these engines in early 90's boat fairly often. Maybe do a compression test on the engine before you spend any money. How many hours are on the engine? Does it have an hour meter? best of luck, Tom