Overview: If you’re aiming to build a stout, reliable small block without breaking into exotic territory, this SBC-compatible block is the perfect foundation. Engineered to comfortably support combinations all the way up to 454 cubic inches, it delivers the strength, precision, and durability builders demand. With thick cylinder walls, a rigid casting, and smart machining allowances, this block is built to handle everything from a crisp street cruiser to a hard-hitting weekend track car.

Cylinder Bore (Rough):
4.120" to 4.122" Cylinder Bore (Max): 4.250" Cam Bearings: Durabond GMP-8 Cam Bearing Bore ID: 2.000"+/- .001" Camshaft Position: OEM Cam Drive / Timing Set: OEM equivalent Cam Retaining Plate: OEM Cubic Inch (Max): 454 Cylinder Wall Thickness: .230" Nominal @ Max Bore Water Jacket Style: Siamese Cylinder Skirt Length: 5.800" Nominal Deck Height: 9.025" +.005" / -.000" Deck Thickness: .600" Nominal Freeze / Core Plugs: 1-5/8" x 10 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): 350 Main - 2.6402" - 2.6410" Main Bearing Caps: Billet Steel 4-Bolt Splayed Main Cap Bolts: 7/16-14 Inner / 3/8-16 Splayed 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 Rear Main Seal: 2 piece Starter: OEM Stroke (Max): Cast in clearance 3.875" Timing Cover: OEM Approx.

Weight with Main Caps:
170-190lbs WARNING: Cancer and Reproductive Harm- www.P65Warnings.ca.gov