SBC 383 450HP Airboat Engine

Starting at $9,495

If you are in the market for a small block Chevy engine with dependable horsepower and torque for your airboat. Our 383 Stroker Engine is what your looking for. Proformance Unlimited's 383CI – 450 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 2 year/200 hour warranty. 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.   


450 @ 5200


476 @ 3550

Bore & Stroke

4.030 - 3.750

  • Fully machined late model 4 bolt main block
  • Eagle forged steel crankshaft 3.750 stroke
  • Eagle forged I-Beam connecting rods with ARP bolts
  • High performance forged pistons (SRP, or Mahle)
  • Performance rod and main bearing (Clevite)
  • Performance rings hand filed to match application
  • ARP main bolts
  • The complete rotating assembly is balanced
  • Three piece double roller timing set
  • Custom ground hydraulic roller camshaft
  • Hydraulic roller lifters
  • AFR performance aluminum cylinder heads
  • (Specialty valve train designed for extreme use)
  • Screw in studs and hardened guide plates
  • Chrome moly push rods
  • Performance roller rockers
  • Melling high volume oil pump and screen
  • 5qt. oil pan
  • Dipstick and tube
  • Painted timing cover
  • Fel-Pro gaskets
  • Performance balancer
  • Edelbrock performance intake manifold (Air-Gap)
  • Quick Fuel 750CFM Marine carb
  • MSD HEI distributor
  • Taylor 8mm ignition wires
  • Black valve covers
  • Breathers
  • Each engine is dyno tested, timing set and carburetor adjusted for optimum performance
  • 2 Year 250 Hour Marine Warranty

Does this engine look like a good fit?