Broken Rod said:
The Vortec 5.7 TQ was 355FT lbs tq. Maybe Merc and Volvo? run the TQ at higher RPMs due to the high number of Express cruiser/and runabouts there powerplants are used in. The marine power your talking about. Is that the inboard motors? Heard they are the most reliable gas inboard motors. Actually built from the block up. Not a converted Auto engine. Not sure about using them in a stern drive boat. Different Bellhousing (Starter location) etc. Dont know if the stern drive parts will bolt on to there motors. Worth looking into. I just installed a fuel flow gauge. Hoping for better MPG also.
I am installing the following engine which is designed specifically for older Volvo Penta sterndrive applications: E5.7V-VR1 315hp/235kw ENPAC - Complete Inboard/Outboard Engine Package Designed to Replace Specific Volvo Packages -Includes : ParPac plus, 12¾" Flywheel, Damper Plate, Volvo -Style Replacement Manifolds and Risers, Seawater Pump, 3' Harness Extension, Alternator, High Torque Bottom Mount Starter, Engine Wiring Harness, Fuel/Water Separator, Flame Arrester, Single Sender Package, Weather Cover, EZ Oil Drain, Superior Corrosion Resistant Urethane Paint. Two Year Limited Warranty Here is a link: http://www.perfprotech.com/store/App_Themes/PPT/images/tech-specs/57volvomp.pdf
I have to use my old bellhousings, but, after that, it just hooks right up. The engine comes with a wiring adapter that plugs right into the Volvo Penta wiring harness, so it is basically plug and play. Like you were saying, I have heard nothing but good things about Marine Power, too, hence the decision to purchase their product ... definitely worth a look!