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No Core Charges EVER!  iMarinePower never carries a core charge for Gas Engines.  Many other companies show a initial lower price for their engines but then have additional core charges.  The end result is the total cost is higher.  Please read our Resource Tech article on this for more explanation. iMarinePower will typically have the lowest overall cost for an engine by the time it gets to your door, Guaranteed!


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1968-1995 5.7L 350ci Remanufactured Long Block Assembly

Our Price: (Members Only)
1968-1995 5.7L 350ci Remanufactured Long Block Assembly
Replacement forMerCruiser, OMC, Crusader, Cobra and Volvo.

  • Left or right side dipstick
  • Available as opposite rotation (call for price)
  • Includes gasket kit and new oil pump
1975-1992 4.3L GM Remanufactured Long Block Assembly

Our Price: (Members Only)
1975-1992 4.3L V6 GM Remanufactured Long Block Assembly
Fits All Applications, Balance Shaft or Non Balance Shaft


1987-2002 GM 7.4L High Performance Big Block

Our Price: (Members Only)
1987-2002 GM 7.4L High Performance Big Block
GEN VI 454 High Performance. The best way to distinguish it from other 7.4L engines is that it has rectangular port heads and a high performance camshaft. They are the same heads that are used on the 502 engines.

Engine Details:
  • Displacement: 7.4L 454 CID
  • Horsepower: 385 hp @ 5200 RPM
  • Torque: 450 lb-ft @ 4000 RPM
  • High Performance Camshaft
  • 1 Piece Rear Main Seal
  • Rectangular Port Heads
Engine Includes:
  • Oil Pan
  • Front Timing Cover
  • Harmonic Balancer
  • Valve Covers
1987-Up 5.7L Carbureted Long Block

Our Price: (Members Only)
1987-Up 5.7L Carbureted Long Block
Replacement forMerCruiser, OMC, Crusader, Cobra and Volvo.

Engine Details:
  • Displacement: 5.7L 350 CID
  • Horsepower: 270 hp @ 4400 RPM
  • Torque: 350 lb-ft @ 3600 RPM
  • Accepts Mechanical Fuel Pump
  • 12 Bolt Pattern Style for Intake
  • 1 Piece Seal
  • Opposite Rotation Available (GN-57-87+-R)
Engine includes:
  • Valve Covers
  • Composite Timing Cover
  • Oil Pan
1996-2007 4.3L Vortec Engine