Hawks Motorsports offers our clients this BPP12110327 GM Big Block Compatible Bare Engine Block - 9.800" Deck x 4.500" 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 serious street, drag racing, marine, and competition applications, this heavy-duty bare block delivers the strength, rigidity, and machining precision required for demanding high-horsepower engine combinations.

Manufactured from high-strength EN-GJL-250 cast iron, this 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, reinforced main webbing, steel billet four-bolt main caps, and priority main oiling system provide exceptional bottom-end strength for naturally aspirated, nitrous, turbocharged, and supercharged engine combinations. It is designed to accommodate crankshaft strokes up to 4.750 inches, supporting engine displacements up to 598 cubic inches.

Compatible with OEM Gen IV timing covers, oil pumps, oil pans, oil filters, starters, hydraulic roller lifter retainers, or aftermarket tie-bar lifters, this BluePrint Engines bare block is an outstanding platform for professional engine builders seeking maximum durability and performance.

Key Features:

• SKU: BPP12110327
• 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
• 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
• 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 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 and piston-to-wall clearance during engine assembly.