I'm looking at a 28' boat with a 10' beam powered with a single high hour 5.7 Volvo pushing a Volvo duoprop. I have yet to be aboard but with a displacement of just under 6000lbs I'm guessing it wouldn't hurt to add a few more ft/lbs of torque across the bottom. I'm kicking around a couple of options.<br /><br />#1. GM Marine Crate Engine 5.7 (350 CID) with Vortec heads. Cost with access. $3300 plus shipping. 355 ft/lbs 3600 RPM and 295 HP 5000 RPM.<br /><br /> http://www.ebasicpower.com/engines/base/ <br /><br />#2. Jasper Performance 383 Marine Engine.<br /><br />440 ft/lbs of torque at 3500 RPM!!!! 350HP at 5000 RPM<br /><br /> http://www.jasperengines.com/performance/chevrol1.pdf <br /><br />Cost in similiar build as above (carb, intake manifold, fuel pump, flame arrestor and ignition) $4083 <br /><br />#3. This is a GM Crate Engine but one they make for the truck market. The cam looks to be perfect for marine use and I would guess needed changes would be freeze plugs, gaskets, water pump and intake manifold. Am I missing any? <br /><br /> http://www.cheapchevyparts.com/id9.html <br /><br />Part # 12497317<br /><br />This is a 383 WITH Vortec heads new from GM. These go for about $3800 new. Not as good as the Jasper even with the Vortec heads.... insteresting. The price above is without many of the accessories and parts included in examples #1 & #2. <br /> http://www.greenwoodchevy.com/engine16.htm <br /><br />I'm leaning towards the Jasper just because they have such a good reputation and it uses proven technology. Not to mention they have a serious torque monster. <br /><br />Any thoughts????
