Hawks Motorsports offers our clients this BPP12110324 GM Big Block Compatible Bare Engine Block - 9.800" 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 598 cubic inches. Designed for serious street performance, drag racing, marine, and custom applications, this heavy-duty bare block delivers exceptional strength, rigidity, and machining precision for today's high-output engine combinations. Thick cylinder walls, reinforced main webbing, and a priority main oiling system provide the durability needed for demanding naturally aspirated and forced induction engine builds.

Manufactured from high-strength EN-GJL-250 cast iron, this bare block features a 9.800-inch deck height, 4.495"-4.497" rough cylinder bore, and can be finish machined to a maximum 4.630-inch bore. The SIAM cylinder bore design, ductile cast iron four-bolt main caps, and OEM Gen IV compatibility make this block an excellent choice for custom BBC engine builds using a wide variety of aftermarket rotating assemblies and cylinder heads. It accepts crankshaft strokes up to 4.750 inches, supporting displacement combinations up to 598 cubic inches.

Compatible with OEM-style timing covers, oil pumps, oil pans, oil filters, starters, hydraulic roller lifter retainers, or aftermarket tie-bar lifters, this BluePrint Engines bare block offers excellent flexibility for professional engine builders and enthusiasts seeking a durable foundation for their next performance engine.

Key Features:

• SKU: BPP12110324
• BluePrint Engines GM Big Block compatible bare engine block
• High-strength EN-GJL-250 cast iron construction
• 9.800" 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: 598 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 Gen IV 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: 240-260 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 rods, pistons, 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.