Hawks Motorsports offers the BluePrint Engines PSM6320CTC1 GM Marine Big Block Compatible 632 C.I. Pro Series Base Dressed Carbureted Engine, delivering massive 775 horsepower and 800 lb-ft of torque designed for high-load marine performance applications. Built to provide extreme displacement, reliable power, and impressive wide-open-throttle performance, this 632 cubic inch Pro Series marine engine is engineered for serious offshore and high-performance boating enthusiasts.

The PSM6320CTC1 features a high-strength cast iron 10.2" deck block, forged rotating assembly, BluePrint aluminum cylinder heads, and hydraulic roller camshaft technology designed for dependable operation under demanding marine conditions. With a 4.500-inch bore, 4.750-inch forged steel crankshaft, forged H-beam connecting rods, and forged pistons, this big block delivers massive torque and horsepower throughout the RPM range.

This Base Dressed Marine configuration includes a 1050 CFM carburetor, Edelbrock aluminum intake manifold, distributor, valve covers, oil pan, timing cover, spark plugs, MSD spark plug wires, and harmonic balancer. Designed as a standard rotation marine engine, the PSM6320CTC1 is built to replace high-performance big block marine applications where maximum torque and durability are required.

Key Features:

• SKU: PSM6320CTC1
• GM Marine Big Block Compatible 632 C.I. Pro Series Engine
• 775 Horsepower
• 800 lb-ft Torque
• Base dressed carbureted configuration
• Designed for high-performance marine applications
• BluePrint high-strength cast iron block
• Manufactured and machined in the USA
• 10.2" deck height block
• 4-bolt main block design
• 4.500" bore
• 4.750" stroke
• 1-piece rear main seal
• Mechanical fuel pump provision
• Forged steel crankshaft
• Forged H-beam connecting rods
• Forged pistons
• Internally balanced rotating assembly
• 10.0:1 compression ratio
• BluePrint PS8012 aluminum cylinder heads
• 119cc combustion chambers
• 358cc intake runners
• 125cc exhaust runners
• 2.300" intake valves
• 1.880" exhaust valves
• Raised exhaust ports (.300" above OEM casting)
• Hydraulic roller camshaft
• Camshaft Specifications:
  • .647" Intake Lift
  • .647" Exhaust Lift
  • 258° Intake Duration @ .050"
  • 266° Exhaust Duration @ .050"
  • 112° Lobe Separation Angle
• 1050 CFM carburetor included
• Edelbrock aluminum intake manifold
• Distributor included
• Valve covers included
• Oil pan included
• Timing cover included
• Spark plugs included
• MSD spark plug wires included
• Harmonic balancer included
• Standard rotation configuration
• Dyno tested before shipment

Fitment Applications:

Designed for custom GM Big Block compatible marine applications, including:

• High-performance offshore boats
• Performance cruisers
• Custom marine builds
• Big block Chevrolet marine conversions
• High-output standard rotation marine applications

Verify marine drivetrain compatibility, bellhousing/flywheel requirements, exhaust system clearance, cooling system design, and rotation direction before installation.

Installation Notes:

• Marine-specific engine assembly.
• Standard rotation only.
• Not available as a reverse rotation engine.
• Designed for carbureted marine applications.
• Requires compatible marine exhaust system.
• Requires proper marine-rated ignition protection components.
• A flame arrestor is recommended for marine carbureted applications.
• For saltwater use, BluePrint recommends a closed cooling system because aluminum cylinder heads and intake manifolds do not feature brass-lined water passages.
• Flywheel/flexplate not included.
• Professional marine installation recommended.