BluePrint Engines GM Big Block Compatible Bare Block – 10.200 Deck x 4.500 Bore, 2-Piece Seal, SIAM, Ductile Cast Main Caps

Overview: When you’re building big power, you need a block that’s ready to carry the load—and this BBC-compatible foundation is engineered to take you all the way to a massive 632 cubic inches. Designed for serious street, strip, and marine performance, this block delivers the strength, rigidity, and machining precision needed for high-horsepower combinations. Thick cylinder walls, robust main webbing, and smartly engineered oiling and cooling pathways give builders the confidence to push displacement and power further without sacrificing reliability. Whether you’re crafting a torque-heavy cruiser or a high-rpm bruiser, this block is the rock-solid starting point your big-inch Chevy build deserves.

Cylinder Bore (Rough):
4.495" to 4.497" Cylinder Bore (Max): 4.630" Cam Bearings: Durabond GM-12 Cam Bearing Bore ID: 2.120"+/- .001" Camshaft Position: OEM Cam Drive / Timing Set: OEM / Double Roller Cam Retaining Plate: OEM Cubic Inch (Max): 632 Cylinder Wall Thickness: .310" Nominal @ Max Bore Cylinder Skirt Length: 6.700" Nominal Deck Height: 10.200" +.005" / -.000" Deck Thickness: .710" Nominal Freeze / Core Plugs: 1-5/8" x 8 Head Bolt / Stud Threads: 7/16-14 UNC Lifter Bores: .8437" +/- .0003" Lifter Retainer (If not using tie bar lifters): OEM W/Roller Provisions Main Bearing Bore (Line Honed): 2.937" - 2.938" Main Bearing Caps: Ductile Cast Iron Main Cap Bolts: 1/2"-13 UNC Main Fastener Tensile Strength: 180,000 to 210,000 PSI P1 Main Stud Kit P/N: TBD ARP Main Stud Kit P/N: TBD Material (Block): EN-GJL-250 Iron Oil System: Priority Main Oil Pump: OEM Oil Filter: OEM Oil Pan: OEM (GEN IV) Rear Main Seal: 2 piece
- Seal (OEM GEN IV) Starter: OEM Stroke (Max): 4.750" Timing Cover: OEM GEN IV Approx.

Weight with Main Caps:
250-270lbs WARNING: Cancer and Reproductive Harm- www.P65Warnings.ca.gov