![]() ![]() I have a friend at a plating shop here in town and I already have an aluminum intake. Do the crank, rods, pistons need to be forged? Are 4-bolt mains necessary, or just a benefit? What should I look for in the oiling system? If I do, what do I look for in a quality build? I know about brass freeze plugs. Does a stock marine exhaust manifold flow better or worse than a typical stock automotive manifold? A little better? A lot better? A lot worse? ![]() should I consider switching to a flat cam to bleed off some of that torque? Is my torque peak at an OK place? Will I be putting too much torque to the Alpha? Will I be on plane by 3000 ya think? That dyno simulation is with a roller cam. Given the power curve, should I tune for 5000 rpm with out any load in the boat so I still have plenty of power at 4500 and up for the extra weight? The dyno simulation below was made using desktop dyno with an off-the-shelf Comp 212/218 marine roller and as-cast vortec iron heads. I need to know some things before forging ahead. jeez that stuff is expensive.Īnyway, I'm shooting for 300 hp with a top RPM of 5000. I know very little about I/Os, but I have a good bit of experience assembling engines so I thought I'd save some cash and build it myself instead of paying someone else $1600 for a shortblock. It currently has a wasted 305 so I'm replacing it with a 350. ![]() A couple questions on a powerplant for my Baja 190 supersport. ![]()
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