Hawks Motorsports offers our clients this BPP12110343 GM Small Block Compatible Bare Block 9.025 Deck x 4.125 Bore, 2-Piece Seal, 350 Main, SIAM, Ductile Cast Main Caps, BluePrint Engines for custom small block Chevrolet engine builds requiring a strong and versatile engine foundation. This bare block is designed around GM Small Block architecture and provides engine builders with a durable platform for high-performance street, restoration, and racing applications.

The BPP12110343 features a 9.025-inch deck height, 4.125-inch cylinder bore, 350 main bearing configuration, 2-piece rear main seal design, SIAM (Siamese) cylinder wall construction, and ductile cast main caps. The larger 4.125-inch bore configuration provides additional displacement potential when properly machined and paired with compatible rotating assembly components.

This GM Small Block compatible bare block is designed for experienced engine builders and machine shops creating custom engine combinations. The SIAM cylinder wall construction provides additional cylinder wall support for large-bore applications, while the ductile cast main caps provide a strong foundation for performance-oriented engine assemblies.

The BPP12110343 is supplied as a bare engine block and requires professional inspection, machining, cleaning, measuring, and final assembly preparation before use. Always verify crankshaft stroke, piston specifications, connecting rod dimensions, cylinder head compatibility, oiling system requirements, and accessory mounting compatibility before beginning assembly.

Key Features:

• Part number BPP12110343
• BluePrint Engines GM Small Block compatible bare block
• 9.025-inch deck height
• 4.125-inch cylinder bore
• 350 main bearing configuration
• 2-piece rear main seal design
• SIAM (Siamese) cylinder wall construction
• Ductile cast main caps
• Cast iron engine block construction
• Designed for custom small block Chevrolet engine builds
• Large-bore foundation for performance engine combinations
• Suitable for street performance, restoration, and racing applications
• Bare block configuration for custom engine assembly
• Requires machining and final preparation before use

Fitment Applications:

GM Small Block Chevrolet Compatible Applications

• Chevrolet Small Block V8 engine builds
• Custom street performance applications
• Restoration engine builds requiring aftermarket small block architecture
• High-performance and racing engine applications

Common Engine Configurations:

• Small Block Chevrolet stroker combinations
• Large displacement small block Chevrolet builds
• Custom small block combinations requiring a 4.125-inch bore configuration
• Engine combinations up to approximately 454 cubic inches when properly machined and assembled

Fitment Note:
Verify engine component compatibility before ordering, including crankshaft stroke, piston compression height, connecting rod length, cylinder head compatibility, intake manifold compatibility, oil pan configuration, accessory mounting requirements, and vehicle-specific installation details.

Installation Notes:

• This listing is for a bare engine block only.
• No rotating assembly, pistons, crankshaft, rods, camshaft, cylinder heads, bearings, timing components, or accessories are included unless specifically stated.
• Block requires professional inspection, machining, cleaning, and final preparation before assembly.
• Verify bore requirements, piston-to-wall clearance, deck height, and bearing clearances before final engine assembly.
• Confirm compatibility of all internal and external engine components before ordering.
• Professional machining procedures are required for bore sizing, honing, deck preparation, align honing, and final engine preparation.
• Verify oiling system, timing components, accessory brackets, transmission compatibility, and vehicle application requirements before installation.
• Professional engine-building experience or qualified machine shop assistance is recommended.