632ci Air Boat Engine Build - 820HP+ Chevy Big Block
09 / 28 / 22

632ci Air Boat Engine Build - 820HP+ Chevy Big Block

632ci Air Boat Engine Build - 820HP+ Chevy Big Block

 The Chevy Big Block engine is known for producing big power since the 1960’s and Prestige Motorsports - 632ci Air Boat Engine Package holds up to that tradition!

632 air boat engine

We start with a World Products Merlin IV iron block and add a set of 2618 Forged Aluminum Pistons, 4340 Forged Steel Crankshaft, H-Beam 4340 Forged Steel Connecting Rods, Prestige Motorsports - Offshore 350 CNC Ported Aluminum Cylinder Heads, PM Custom Ground Hydraulic Roller Camshaft, and a Stef’s Fabrication Marine (Air Boat specific) Oil Pan.

632 air boat engine holley new 

We use Holley HP EFI Engine Management a Holley 2000CFM Throttle Body and Holley Fuel Rails for consistent and tunable fuel delivery.

 632 air boat engine TBody 1

Once the engine has been machined and fully assembled, we set it up on the engine dyno for tuning with Holley’s HP EFI software and make some short pulls, plus “steady state” high RPM sustained pulls to simulate the way an Air Boat runs, with an eye on oil pressure and engine temps. We fine tune the engine with (8) O2 sensors for optimum air/fuel ratios and maximum performance. Here we are calibrating the oxygen sensors before dyno tuning.

 632 air boat engine sensors

Once dyno tuning is complete, the engine is removed from the dyno, and we box it up in a hand-made wooden crate and ship it off to one of amazing our customers.

 632 air boat engine shipping

After installation in the air boat, the customer will be able to fire it up and enjoy the massive 820HP+ produced by this pump gas, 632ci Big Block Chevy Air Boat engine for years to come!

Engine Specs:

  • Horsepower: 820+
  • Torque: 840+
  • Bore/Stroke: 4.600 x 4.750
  • Compression: 10.5:1
  • Fuel Type: Pump Gas, 93 AKI (USA) / 98 RON
  • Block: Aftermarket 10.2, Iron
  • Crankshaft: 4340 Forged
  • Rods: H-Beam, 4340 Forged Steel
  • Pistons: 2618 Forged Aluminum, Gas Ported
  • Bearings: Clevite H-Series Coated
  • Camshaft: Hydraulic Roller
  • Heads: PM Offshore 350 Aluminum, CNC Rectangle Port
  • Valves: Ferrea Super Alloy Exhaust, 6000 Series Intake
  • Rocker Arms: Billet Aluminum, Full Roller, Girdled
  • Intake: Custom Pro-Filer Sniper Aluminum
  • Oil Pan: Marine
  • Throttle Body: Holley 2000CFM, Billet Aluminum
  • Valve Covers: Polished Aluminum, Custom Made Dual Breathers
  • Power Adder: N/A
  • Fuel Delivery: Holley HP EFI
  • Ignition: Dual Sync Distributor

 632 air boat engine TBody 2

Call Prestige Motorsports for more details on this engine or to get a quote for your next project!

 632 air boat engine tuning table

632 air boat engine remote tuning

Also be sure to check out our Remote Tuning Service online or call Prestige Motorsports.