Gph
I have an "82" with the 470. After re-doing the head gasket and every part of the cooling system (boat sat for 11 years) the engine is running perfect.
What I found about the 470 - Some people don't like them and some people love them. I found these engines were put in a lot of boats throughout the 80's and early 90's and many people neglected the general maintenance needed.
The 470 is a great match for the V20 but will not be as fast as the outboards in the 150 plus range. Fuel economy should be at least 3MPG at optimal cruising speed. I did not do any test on fuel consumption yet, but I am hoping to burn 5 GPH at 20 knots. I think it will come in closer to 6GPH but we will see.
I am turning a 14 X 17 aluminum prop. In a light boat, I am getting 4800 RPMs - I might switch to a stainless Mirage in the same size.
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