Hawks Motorsports offers our clients this BPP12110329 GM Big Block Compatible Bare Engine Block - 10.200" Deck x 4.500" 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 632 cubic inches. Designed for serious street performance, drag racing, marine, and custom applications, this heavy-duty bare block provides exceptional strength, rigidity, and machining precision for today's high-horsepower engine combinations. It features SIAM cylinder bores, a priority main oiling system, and ductile cast iron four-bolt main caps to deliver excellent durability and bottom-end stability.

Manufactured from high-strength EN-GJL-250 cast iron, this block features a 10.200-inch deck height, 4.495"-4.497" rough cylinder bore, and can be finish machined to a maximum 4.630-inch bore. The block accepts crankshaft strokes up to 4.750 inches, allowing engine builders to create displacement combinations up to 632 cubic inches. Compatible with OEM Gen IV timing covers, oil pumps, oil pans, oil filters, starters, and hydraulic roller lifter retainers, this block offers outstanding flexibility for custom engine builds.

Whether you're assembling a naturally aspirated street engine, turbocharged or supercharged competition engine, or a marine powerplant, this BluePrint Engines bare block provides a durable platform for your next BBC project.

Key Features:

• SKU: BPP12110329
• BluePrint Engines GM Big Block compatible bare engine block
• High-strength EN-GJL-250 cast iron construction
• 10.200" deck height (+.005"/-.000")
• 4.495"-4.497" rough cylinder bore
• 4.630" maximum finished bore
• Supports up to 4.750" crankshaft stroke
• Maximum displacement: 632 cubic inches
• SIAM cylinder bore design
• Ductile cast iron four-bolt main caps
• Priority main oiling system
• OEM Gen IV 2-piece rear main seal
• OEM timing cover compatible
• OEM oil pan compatible
• OEM oil pump compatible
• OEM oil filter compatible
• OEM starter compatible
• Accepts Durabond GM-12 cam bearings
• Compatible with OEM or double roller timing sets
• Hydraulic roller or tie-bar lifter compatible
• Approximate weight with main caps: 250-270 lbs
• Sold individually

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 engine builds

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

Installation Notes:

• Bare engine block only.
• Rotating assembly not included.
• Cylinder heads not included.
• Camshaft not included.
• Cam bearings not installed.
• Freeze plugs and oil galley plugs should be verified before assembly.
• Final bore honing and finish machining are required.
• Verify crankshaft, connecting rod, piston, and oil pan compatibility before assembly.
• Professional machining and blueprinting are recommended.
• Confirm all bearing clearances, piston-to-wall clearance, and deck height during engine assembly.