Motor is a 4 cylinder a big honkin 3.7 liter four designed by mercruiser. To me it idles like a tractor and has the torque to match. Unlike most of our inboard engines. It is not an automotive motor that has been marinized but rather a mercruiser designed motor that uses some ford components. I used to sell Porsches and we had a 3.0 liter four in the 944, we would say it was the largest most powerful 4 cylinder (normally aspirated) of the time 1989-1990. That 3.0 used balance shafts licensed by mitsubushi to offset vibrations. The 470 series has no balance shafts depends what you compare it to but idle quality is a bit shaky. You get used to it.
Brian
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