Hawks Motorsports offers the BluePrint Engines PS5403 GM Big Block Compatible 540 C.I. Pro Series Power Adder Short Block, engineered specifically as the ultimate foundation for supercharged, turbocharged, and nitrous-assisted Big Block Chevrolet compatible engine builds. Featuring a fully forged rotating assembly, heavy-duty block, and low-compression design, this Pro Series short block is built to withstand extreme cylinder pressures while providing outstanding durability and reliability under boost.

The PS5403 is built around a high-strength cast iron 4-bolt main block with a 4.500-inch bore, 4.250-inch forged steel crankshaft, 6.385-inch forged H-beam connecting rods, and 15.4cc forged dished pistons. Designed for use with 118cc combustion chamber cylinder heads, the combination delivers an 8.5:1 compression ratio, making it ideal for forced induction applications where detonation resistance is critical. The internally balanced rotating assembly provides exceptional durability for high-horsepower street, drag race, and marine builds.

Whether you're building a twin-turbo street car, roots-blown drag engine, centrifugal supercharger setup, or nitrous-powered race combination, the PS5403 provides the premium foundation needed for serious power.

Key Features:

• SKU: PS5403
• BluePrint Engines GM Big Block Compatible Pro Series Power Adder Short Block
• 540 cubic inch displacement
• Designed specifically for supercharger, turbocharger, and nitrous applications
• High-strength cast iron engine block
• 4.500" bore
• 4.250" forged steel crankshaft
• Forged 6.385" H-beam connecting rods
• Forged 15.4cc dished pistons
• 8.5:1 compression ratio (with 118cc cylinder heads)
• Internally balanced rotating assembly
• Splayed 4-bolt main caps
• 1-piece rear main seal
• Mechanical fuel pump provision
• Standard deck height
• Manufactured and machined in the USA
• Sold as a short block only

Fitment Applications:

Designed for custom GM Big Block Chevrolet compatible engine builds, including:

• Chevrolet Camaro
• Chevrolet Chevelle
• Chevrolet Nova
• Chevrolet El Camino
• Chevrolet Corvette
• Chevrolet Impala
• Chevrolet C10, C20 & C30 Pickup
• Street rods
• Pro Touring builds
• Drag racing vehicles
• Marine applications
• Custom high-performance BBC builds

Verify compatibility with your cylinder heads, oil pan, timing cover, balancer, flywheel/flexplate, and accessory drive system before ordering.

Installation Notes:

• Short block assembly only.
• Cylinder heads not included.
• Camshaft and valvetrain not included.
• Intake manifold not included.
• Carburetor or EFI system not included.
• Ignition system not included.
• Harmonic balancer sold separately.
• Flywheel/Flexplate sold separately.
• Professional installation is recommended.
• Intended for custom high-performance engine builds.