BluePrint Engines BPP12110324 BBC Block, 9.800 Deck x 4.500 Bore

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 589 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.

• Supports big-block Chevy builds up to 598 cubic inches with up to a 4.750-inch stroke and 4.630-inch max bore
• Heavy-duty EN-GJL-250 iron construction with thick .310-inch nominal cylinder walls at max bore for strength and durability
• Priority main oiling system helps deliver dependable lubrication for high-performance street, strip, and marine applications
• Reinforced main webbing, ductile iron main caps, and high-strength fasteners provide a stable bottom-end foundation
• Designed for OEM-style compatibility with GEN IV oil pan, timing cover, oil pump, starter, rear main seal, and camshaft position layout

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):

• 598

Cylinder Wall Thickness:

• .310" Nominal @ Max Bore

Cylinder Skirt Length:

• 6.300" Nominal

Deck Height:

• 9.800" +.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

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:

• 240-260lbs