Hawks Motorsports offers our clients this BPP12110332 GM Big Block Compatible Bare Engine Block - 9.800" Deck x 4.250" Bore - 2-Piece Rear Main Seal - SIAM Cylinder Bores - Steel Billet 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 demanding street, drag racing, marine, and competition applications, this heavy-duty bare block delivers exceptional strength, rigidity, and machining precision for today's high-horsepower engine combinations. Thick cylinder walls, reinforced main webbing, a priority main oiling system, and premium steel billet main caps provide outstanding durability for naturally aspirated and forced induction builds.

Manufactured from high-strength EN-GJL-250 cast iron, this block features a 9.800-inch deck height, 4.245"-4.247" rough cylinder bore, and can be finish machined to a maximum 4.630-inch bore. Designed to accept crankshaft strokes up to 4.750 inches, it supports engine displacements up to 598 cubic inches. The SIAM cylinder bore design maximizes cylinder wall strength while maintaining compatibility with OEM Gen IV timing covers, oil pumps, oil pans, oil filters, starters, and hydraulic roller lifter retainers or aftermarket tie-bar lifters.

Whether you're building a naturally aspirated street engine, turbocharged or supercharged race engine, marine powerplant, or custom BBC performance combination, this BluePrint Engines bare block provides the strength and reliability required for serious horsepower.

Key Features:

• SKU: BPP12110332
• BluePrint Engines GM Big Block compatible bare engine block
• High-strength EN-GJL-250 cast iron construction
• 9.800" deck height (+.005"/-.000")
• 4.245"-4.247" rough cylinder bore
• 4.630" maximum finished bore
• Supports up to 4.750" crankshaft stroke
• Maximum displacement: 598 cubic inches
• SIAM cylinder bore design
• Steel billet 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
• Cylinder wall thickness: .310" nominal @ max bore
• Deck thickness: .710" nominal
• Cylinder skirt length: 6.300" nominal
• Main bearing bore (line honed): 2.937"-2.938"
• Main cap bolts: 1/2"-13
• 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, engine mounts, or accessory drive systems.

Installation Notes:

• Bare engine block only.
• Rotating assembly not included.
• Cylinder heads not included.
• Camshaft not included.
• Cam bearings not installed.
• Freeze/core plugs not installed.
• 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, deck height, and piston-to-wall clearance during engine assembly.