I bought my first boat last jan., & it came with a 1972 55HP Chrysler outboard. I don't think I am getting all 55HP out of even thou the compression level on both cylinders were great. It pushes me (by myself) at about 21mph, it is a 16ft fishing bass boat, but if someone else is in the boat it drops down alot. So that's why they upgrade. My question is. I was talking to find who has been boating for years, and he said I should look at a new engine (90's) same 40-50HP would be better then a 80's 75-85HP. He said I would be better to get a newer engine with less HP then a older with more HP. He said the newer engine may have less HP but it actually perform about the same. I was wondering what your thoughts were?