Hawks Motorsports offers our clients this BPP12110326 GM Big Block Compatible Bare Engine Block - 10.200" 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 building high-performance GM Big Block compatible engines up to 632 cubic inches. Designed for serious street, drag racing, marine, and custom performance applications, this heavy-duty bare block delivers the strength, rigidity, and machining precision required for high-horsepower engine combinations.

Manufactured from high-strength EN-GJL-250 cast iron, this block features SIAM cylinder bores, a 10.200-inch deck height, and a 4.600-inch rough bore capable of being finish machined to a maximum 4.630-inch bore. The priority main oiling system, reinforced main webbing, and ductile cast iron main caps provide exceptional durability for high-performance builds while maintaining compatibility with many OEM Gen IV-style components.

The block is designed to accept strokes up to 4.750 inches, allowing engine builders to assemble displacement combinations up to 632 cubic inches. It is machined for OEM-style timing covers, oil pumps, oil filters, starters, and utilizes a 2-piece rear main seal configuration. The lifter valley is configured for OEM-style hydraulic roller lifter retainers or aftermarket tie-bar lifters, offering excellent flexibility for custom engine builds.

This bare block is an excellent starting point for professional engine builders and enthusiasts seeking a durable foundation for naturally aspirated or forced induction big block Chevrolet-compatible engine projects.

Key Features:

• SKU: BPP12110326
• BluePrint Engines GM Big Block compatible bare engine block
• Maximum displacement: 632 cubic inches
• High-strength EN-GJL-250 cast iron construction
• 10.200" deck height
• 4.600" rough cylinder bore
• 4.630" maximum finished bore
• 4.750" maximum stroke
• SIAM cylinder bore design
• Ductile cast iron main caps
• Priority main oiling system
• 2-piece rear main seal
• OEM Gen IV timing cover compatibility
• OEM oil pump compatibility
• OEM oil filter compatibility
• OEM starter compatibility
• Accepts Durabond GM-12 cam bearings
• Double roller timing set compatible
• Sold as a bare block
• Approximate block weight with main caps: 250-270 lbs

Fitment Applications:

Designed for custom GM Big Block Chevrolet compatible engine builds.

Common applications include:

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

Verify compatibility before ordering, especially regarding rotating assembly, cylinder heads, oil pan, timing cover, engine mounts, and accessory drive components.

Installation Notes:

• Bare block only.
• Rotating assembly is not included.
• Cylinder heads are not included.
• Camshaft is not included.
• Bearings are not included unless specifically stated.
• Final bore honing is required.
• Final machining should be performed by a qualified engine builder.
• Verify piston-to-wall clearance and bearing clearances during assembly.
• Confirm compatibility with intended crankshaft stroke and rotating assembly.
• Verify oil pan, timing cover, rear main seal, and accessory compatibility before assembly.