Quote Originally Posted by filthy phill View Post
I am not understanding what your saying about DENSER FUEL MIXTURE ?
do you mean a richer mixture ?
Yes, because of the smaller carbs. You will get more fuel, less air at the start. The stock oval port has approximately 145 compression.

I fellow over here did an interest test. He had both a 1994 oval port 70 hp on a family runabout and a 1986 bridge port 70 hp on another family runabout . He switched the carbs. The only change he did was to replace the 69 jet in the 1986 carbs with a 73 jet. The bridge port boat ran basically the same as before. The oval port boat ran 3 miles an hour faster with the larger carbs. Just one test and I wonder if others get the same result.