LS3 416 575HP Airboat Engine Fuel Injected

Starting at $16,595

If you are in the market to re-power your airboat with an all aluminum engine with dependable horsepower and torque, our Gen IV Engine is what your looking for. Proformance Unlimited's LS3 416 ci – 575 HP package was designed with reliability and fuel economy in mind, while not sacrificing performance that can handle all types of environmental conditions. All of our complete airboat engines are built with superior parts, custom painted and backed by a 1 year/Unlimited hour warranty. This engine package comes complete with a marine grade ECM, wiring harness and sensors.  
Here at Proformance Unlimited, we have years of designing and building engines with dependability and performance that will stand the test of time. Feel free to contact us with any questions you may have.   


575 @ 6300


545 @ 5500

Bore & Stroke

4.065 - 4.000

  • GM Performance Aluminum LS3 6.2L block
  • Block, heads, oil pan, timing cover custom painted (customers choice of color)
  • Eagle 4340 forged 4.00 stroke crankshaft with 58x reluctor wheel
  • Eagle H-Beam connecting rods
  • Forged performance pistons (Arias or Mahle)
  • Performance ring pack
  • Performance rod and main bearings
  • Complete rotating assembly internally balanced
  • Performance rectangle port cylinder heads (AFR or RHS)
  • Comp Cams performance valve springs
  • Custom ground hydraulic roller camshaft
  • PFU spec hydraulic roller lifters
  • Timing chain set
  • Melling oil pump
  • Comp Cams roller rockers 1.8
  • Chrome moly pushrods
  • Performance oil pan (8.5 quart)
  • Aluminum timing cover
  • Gasket set
  • Holley Sniper fabricated sheetmetal intake manifold powder coated black
  • Holley Terminator MPFI LS EFI master kit
  • 39lb Injectors
  • Holley Sniper LS throttle body 92MM cable driven
  • Performance coil over packs
  • Tall aluminum valve covers
  • Taylor 8mm wires (Customers choice of color)
  • Performance balancer
  • TrickFlow water cross over tube and plumbing
  • AC Delco spark plugs
  • Oil and filter
  • Sensors and wiring harness needed to make run engine
  • Your engine is dyno tested, and tuned for optimum performance
  • We video your engine dyno test and send you a copy
  • Additional Items:
  • Starter
  • March Performance Serpentine Pulley Kit
  • Aluminum water pump
  • 140 amp Chrome GM CS130 Alternator
  • Alternator pulley with fan and nose cover
  • Alternator bracket
  • A/C bracket
  • Chrome Sanden 7176 A/C Compressor
  • Crank pulley
  • Idlers
  • All mounting hardware

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