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CHEVROLET PERFORMANCEPART NUMBER: 809-12370850

ZL1 Aluminum Engine Block, BB Chevy

Name: ZL1 Aluminum Engine Block, BB Chevy
Brand: CHEVROLET PERFORMANCE
SKU: 809-12370850
Price: 8623.99 USD
Availability: InStock

^$8,623⁹⁹

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Ships on 09/11/2026

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Big Block Chevy (2-Piece Rear Main Seal)
Standard Deck: 9.800''
Steel 4-Bolt Main
Main Bolts: 16°
Bore Range: 4.240' to 4.300'
Fuel Pump Boss: Yes
Cylinder Walls: Siamese
Crankshaft Journal Size: 2.750'
Oiling System Configuration: Wet
Maximum Crankshaft Stroke: 4.375'
Block Weight: 110 pounds
Maximum Tested Horsepower: 650 HP
Required Cam Bearing Set: 809-12499434

Part TypeEngine Block

BrandCHEVROLET PERFORMANCE

Package Height19.0

Package Width21.0

Package Length28.0

Weight200.0 PG

Part CategoryPerformance Parts

Main Journal TypeOEM

Engine Block StyleAftermarket

Engine Block MaterialAluminum

Cylinder Bore As Shipped4.24 in (107.696 mm)

QuantitySold individually

Raised Cam LocationNo

Freeze Plugs IncludedYes

Main Bolt Style4-bolt

Deck Height9.8 in (248.92 mm)

Main Bearings IncludedNo

Main Cap MaterialSteel

Rear Main Seal Style2-piece

Main Caps IncludedYes

Finished Cylinder BoresYes

Cylinder Bore Diameter4.25 in (107.95 mm)

Cam Bearings IncludedNo

Main Cap Fasteners IncludedYes

Vendor Part Number12370850

Package Qty1

Package TypeEA

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