dont forget me...I am in Ocean City MD and I also have the 470. Not sure about speed though...nothing to measure speed. I would guess though high 20s at 3700 RPM. I dont push her any harder than that...she is an old girl. My motor is original to the boat.
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CY 1984 V20 STEP LIFT I/O 470 MERCRUISER Wheeling, WV
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