Silver Wraith 7.6L 380bhp

V8 Small Block Chevy 463cid

7.6L 380bhp V8 Performance Marine engine rebuilds This engine is perfect for the discerning boat owner who either has to replace his engine, or wants to upgrade his performance without incurring any fuel consumption penalties. In fact by careful development and the use of competition quality components the efficiency of this engine has been improved to the point of actually using less fuel to produce more power thereby giving a noticeably more economical cruising speed. It delivers its power, both BHP and torque at a considerably lower RPM than standard "Crate" engines.

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7.6L 380bhp V8 Performance Marine engine rebuilds A glance at the improvement in BHP and specification will show that this engine gives surprisingly good value for money. Like all Swaymar special series engines it is perfectly balanced too delivers bags more torque and BHP several hundred rpm lower down the rev range than its factory replacement counterpart. Specifically designed for Hi-torque, this engine is perfect for marine applications. These carefully considered engineering improvements result in a considerably faster boat but without the usual fuel penalties associated with more power.


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

Only suitable for Mercruiser's equipped with Bravo legs, Bravo legs are rated at 500BHP. Alpha legs are rated at 300BHP. Can be used with most Volvo Penta drive legs, as most are duo prop.


All of our engines include a free inlet manifold inspection and reconditioning to 'as good as new'.
Note: If prior to inspection your existing manifold is un serviceable, a new one will be required.

  • Fresh water cooling system
  • Stage 1 performance marine camshaft
  • Full refurbishment and re assembly of existing ancillaries


Most but not all engines that are sea water cooled will require a new block upon rebuild.

  • Re-manufactured block
  • Brand new block


  • 1 year limited warranty,subject to the fitting of a new or refurbished inlet manifold and new cast iron exhaust manifolds
  • 2 years limited warranty when fitted with 1 piece stainless steel exhaust manifolds

Not Included

  • *New Cast iron exhaust manifold*
  • *New Inlet manifold*


5.0L 280bhp V8 Performance Marine engine rebuilds We strongly recommend to all of our customers to consider trying a 1 piece stainless exhaust system and do away with the fear of leaky cast iron ones ruining your engine. You can find more detailed information on stainless steel marine exhausts as well as independent articles written by marine surveyors on the pit falls of cast iron manifolds at

Propeller Pitch

5.0L 280bhp V8 Performance Marine engine rebuilds 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.

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Displacement 463CID (7.6L)
Engine Type V8
Peak Torque 485-490 ft lbs @ 4000 RPM
Torque Range 450+ ft lbs @ 2700 - 4300 RPM
Bore & Stroke 4.290" X 4.0" (108.966mm X 106.6mm)
Compression Ratio 9.5:1
Camshaft Stage 1 - Specially developed marine camshaft - delivering more torque at lower rpm.
Major Components Steel crankshaft, forged competition con rods, and performance pistons.
Head & chamber work Light reshaping of combustion chambers and cylinder heads - Improve gas flow and increase torque.
Cooling System Closed fresh water cooling, Long Life 5-Year Anti-Freeze, 20 year long life silicon hoses - Protecting your engine from the inside out.
Advanced Engine Lubrication System Expertly modified oil galleries provide greatly improved lubrication to the camshaft, cam followers, gears and timing chain - For optimum engine longevity.
Dimensions (LxWxH) in 43x 30 x 22
Dimensions (LxWxH) mm 1092 x 740 x 559
Weight (lbs./kg) 948/431
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