Hawks Motorsports offers our clients this BPP12110328 GM Big Block Compatible Bare Engine Block - 9.800" Deck x 4.600" Bore - 2-Piece Rear Main Seal - SIAM Cylinder Bores - Ductile Cast Main Caps - BluePrint Engines engineered as a premium foundation for high-performance GM Big Block compatible engine builds up to 598 cubic inches. Designed for serious street, drag racing, marine, and custom performance applications, this heavy-duty bare block provides exceptional strength, rigidity, and machining precision for demanding horsepower levels.

Manufactured from high-strength EN-GJL-250 cast iron, this block features SIAM cylinder bores, a 9.800-inch deck height, and a 4.595"-4.597" rough bore capable of being finish machined to a maximum 4.630-inch bore. Reinforced main webbing, a priority main oiling system, and ductile cast iron four-bolt main caps provide excellent bottom-end stability while maintaining compatibility with many OEM Gen IV-style components.

Designed to accept crankshaft strokes up to 4.750 inches, this block is capable of supporting displacement combinations up to 598 cubic inches. It accepts OEM-style timing covers, oil pumps, oil filters, starters, hydraulic roller lifter retainers, or aftermarket tie-bar lifters, making it an excellent platform for custom engine builds.

Whether you're building a high-performance street engine, drag racing combination, marine engine, or custom big-inch Chevrolet project, this BluePrint Engines bare block delivers the strength and flexibility needed for today's high-output engine combinations.

Key Features:

• SKU: BPP12110328
• BluePrint Engines GM Big Block compatible bare engine block
• High-strength EN-GJL-250 cast iron construction
• 9.800" deck height (+.005"/-.000")
• 4.595"-4.597" rough bore
• 4.630" maximum finished bore
• Supports up to 4.750" stroke
• Maximum displacement: 598 cubic inches
• SIAM cylinder bore design
• Ductile cast iron four-bolt main caps
• Priority main oiling system
• 2-piece OEM Gen IV rear main seal
• OEM timing cover compatible
• OEM oil pump compatible
• OEM oil filter compatible
• OEM starter compatible
• Accepts Durabond GM-12 cam bearings
• OEM or double roller timing set compatible
• Hydraulic roller or tie-bar lifter compatible
• Approximate weight with main caps: 240-260 lbs
• Bare block configuration

Fitment Applications:

Designed for custom GM Big Block Chevrolet compatible engine builds.

Common applications include:

• Chevrolet Camaro
• Chevrolet Chevelle
• Chevrolet Nova
• Chevrolet El Camino
• Chevrolet Corvette
• Chevrolet Impala
• Chevrolet C10 Pickup
• Street rods
• Drag racing vehicles
• Marine applications
• Custom high-performance engine builds

Verify fitment before ordering, especially when using aftermarket rotating assemblies, cylinder heads, oil pans, engine mounts, or accessory drive systems.

Installation Notes:

• Bare engine block only.
• Rotating assembly not included.
• Cylinder heads not included.
• Camshaft not included.
• Bearings not included.
• Freeze plugs and oil galley plugs should be verified before assembly.
• Final bore honing is required.
• Professional machining and blueprinting are recommended.
• Verify piston, crankshaft, rod, and oil pan compatibility before final assembly.
• Confirm all bearing clearances and piston-to-wall clearances during engine build.