427CI / 590HP GTO/MAS Small Block

New to the GTO Performance Airboats lineup, the small block 427 engine has the weight of a small block with the performance of a big block. We start with a new Dart SHP Block with a 4.125bore, Splayed 4-bolt main cast iron block, forged internal rotating assembly, 10.1:1 compression ratio, and aggressive hydraulic roller cam. The engine’s top half includes a pair of CNC ported AFR heads, the intake is a matching high-flow Victor Jr. aluminum piece. With 590 ft/lbs torque and a conservative 590 HP rating, this is one of the best engine choices for an excellent performing ride boat.


  • Engine Type: SB-Chevy V8
  • Displacement: 427 ci
  • Bore: 4.125″
  • Block: Dart SHP “Little M” Cast iron with Splayed 4-bolt main caps
  • Crankshaft & Connecting Rods: Forged steel with H-Beam Rodes
  • Pistons: Forged aluminum
  • Camshaft: Hydraulic roller
  • Cylinder Heads: Aluminum AFR – CNC Ported
  • Compression Ratio: 10.1:1
  • Rocker Arms: Comp ProMagnum roller, 1.6:1 ratio
  • Distributor: HEI
  • Carburetor: 850cfm QuickFuel
  • Spark Plugs: Included
  • Balanced: Internally
  • Recommended Fuel: 92 octane
All engines are computer balanced, blue printed and dynoed before shipping.  Engines also come with build documentation and a 2 year unlimited hour warranty.

Also available with aluminum block.  All aluminum version features a World Products/PBM Motown Block — Complete engine weights 386lbs with all accessories.

Price:  $CALL

4600 W. Hwy 326, Ocala, Florida 34482 - Telephone: 352-401-9070
Hours: Monday-Friday 8:00am - 6:00pm Saturday: 10:00am - 4:00pm