413 marine industrial (E) engine, to, not so industrail......

Thank you challenger. I figured a set of custom pistons were in order. So that's doable. Who would know what compression I would need to run 87, with a 160f thermostat. I was thinking 9-1 at first. As far as the cam, I was wanting to go short duration higher lift solid tappet. With a narrow lcl to build power up quick and drop it quick, since the useable rpm range is 1500rpm bottom to top.. And a boat has no need for idle tq, power needed is directly related to rpm. Thoughts?