Hawks Motorsports offers our clients this BPP12110348 GM Small Block Compatible Bare Block 9.025 Deck x 4.125 Bore, 2-Piece Seal, 400 Main, SIAM, Splayed Steel Billet Main Caps, BluePrint Engines for custom high-performance small block Chevrolet engine builds requiring a strong and durable foundation. This bare engine block is designed around GM Small Block architecture and provides engine builders with a versatile platform for large displacement street performance, restoration, and racing applications.

The BPP12110348 features a 9.025-inch deck height, 4.125-inch cylinder bore, 400 main bearing configuration, 2-piece rear main seal design, SIAM (Siamese) cylinder wall construction, and splayed steel billet main caps. This configuration is designed for demanding small block combinations where increased bore capability, main bearing support, and long-term durability are important considerations.

The SIAM cylinder wall design provides additional cylinder wall support for large bore applications, while the splayed steel billet main caps provide enhanced stability for high-performance rotating assemblies. The 400 main bearing configuration offers compatibility with specific large journal small block Chevrolet crankshaft combinations when properly matched with the complete engine assembly.

This BPP12110348 bare block is supplied as a foundation component only and requires professional machining, inspection, cleaning, measuring, and final assembly preparation. Engine builders should verify compatibility of all internal and external components, including crankshaft, pistons, rods, cylinder heads, oiling system, accessory mounting, and transmission requirements before assembly.

Key Features:

• Part number BPP12110348
• BluePrint Engines GM Small Block compatible bare block
• 9.025-inch deck height
• 4.125-inch cylinder bore
• 400 main bearing configuration
• 2-piece rear main seal design
• SIAM (Siamese) cylinder wall construction
• Splayed steel billet main caps
• Cast iron engine block construction
• Designed for custom small block Chevrolet engine builds
• Large bore configuration for increased displacement potential
• Enhanced main bearing support for high-performance applications
• Suitable for street performance, restoration, and racing engine builds
• Bare block configuration for custom engine assembly
• Requires professional machining and final preparation before use

Fitment Applications:

GM Small Block Chevrolet Compatible Applications:

• Chevrolet Small Block V8 custom engine builds
• Performance street engine 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 SBC combinations requiring a 4.125-inch bore configuration
• Engine combinations up to 454 cubic inches when properly machined and assembled

Fitment Note:
Verify engine component compatibility before ordering, including crankshaft main journal size, 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 size, piston-to-wall clearance, deck height, bearing clearances, and rotating assembly compatibility before final 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.