Silver Wraith 5.0L 280hp

V8 Small block chevy 300cid

5.0L 280bhp V8 Performance Marine engine rebuilds This engine is specifically designed for the discerning 300 cid (5 litre) owner who needs to replace or is looking to upgrade his basic crate engine(s) for something more sophisticated and reliable, that will put that little extra sparkle into its performance, and at the same time improve fuel consumption.


Torque Range 340 ftlbs @ 4300 RPM
Displacement 300 CID (5.0L)
Engine Type V8
Bore & Stroke 4.00" X 3.48" (101mm X 88mm)
Compression Ratio 9.5:1
Camshaft Specially developed marine camshaft - delivering more torque at lower rpm.
Major Components Forged crank, competition rods, and Plasma Nitrited performance pistons.
Head & chamber work Light reshaping of combustion chambers and heads to improve gas flow and increase torque.
Exhaust System 1 Piece Stainless Steel Long Life exhaust system. 5 year Guarantee. (strongly recommended)
Cooling System Closed Cooling, Long Life 5-Year Anti-Freeze, Brass Sea Water Pump. 20 year long life silicon hoses.
Advanced Engine Lubrication System Oil galleries are modified to provide extra lubrication to cam and timing chain.
Dimensions (LxWxH) in 43x 30 x 22
Dimensions (LxWxH) mm 1092 x 740 x 559
Weight (lbs./kg) 948/431
Full Closed Cooling System Recommended


  • Steel crankshafts.
  • Steel connecting rods with bronze small end bushes.
  • Forged or Hyperutectic pistons dependant on application.
  • Fully floating piston pins, circlip retained.
  • Competition or race quality piston rings.
  • Heavy duty or race quality big end & main bearings.
  • New oil pumps, modified to give higher PSI at low RPM.
  • Re-shaped combustion chambers to increase low end torque.
  • Inlet ports in both cylinder heads and inlet manifolds matched to increase both BHP & torque at all RPM.
  • Specially developed marine application, plasma nitrided cams & followers.

Whilst the improvement in output at first glance appears quite modest, it should be borne in mind that this improvement in BHP and torque is in both cases several hundred RPM lower than its standard factory counterpart, which gives the driving impression of being considerably more powerful without the usual fuel penalties.


Depending on boat, in order to prevent over-revving, and feel the full effect of its extra torque, this engine may need to carry a larger diameter or coarser pitch propeller.


  • Mercruiser
  • Volvo Penta
  • Indmar
  • any boat running Chevy V8s

In the case of Mercruiser can be used with Alpha or Bravo legs can be used with most Volvo Penta drive legs


We strongly recommend to all of our customers to consider trying a 1 piece stainless exhaust system and do away with replacing leaky cast iron manifolds ones every 2 years. To us the idea of running salt water through your engine in order to cool it down seems frankly barbaric. A decent fresh water cooling system should be considered an investment.