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Chevrolet Performance 12370850

ZL1 Aluminum Engine Block Big Block Chevy (2-Piece Rear Main Seal)

Chevrolet Performance 12370850

809-12370850

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Chevrolet Performance 12370850 ZL1 Aluminum Engine Block Big Block Chevy (2-Piece Rear Main Seal) $5,388.68
ZL1 Aluminum Engine Block
  • Big Block Chevy (2-Piece Rear Main Seal)
  • Standard Deck: 9.800''

  • Chevrolet Performance 12370850 Details

  • 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

  • Specifications:

    Rear Main Seal Style
    2-Piece
    Cam Bearings Included
    No
    Cylinder Bore as Shipped (in.)
    4.24
    Cylinder Bore Diameter (in.)
    4.25
    Deck Height (in.)
    9.8
    Engine Block Material
    Aluminum
    Engine Block Style
    Aftermarket
    Finished Cylinder Bores
    Yes
    Freeze Plugs Included
    Yes
    Main Bearings Included
    No
    Main Bolt Style
    4-bolt
    Main Cap Fasteners Included
    Yes
    Main Cap Material
    Steel
    Main Caps Included
    Yes
    Main Journal Type
    OEM
    Quantity
    Sold individually
    Raised Cam Location
    No
    Manufacturer's Part Number:
    12370850

    ZL1 was the legendary regular production option (RPO) code that struck fear into all competitors who faced 1969 Camaros--and a few Corvettes--equipped with this 427-cubic-inch monster from the factory. The price to own an original ZL1 has surpassed the value of some homes, but you can build your own ZL1 powerhouse thanks to Chevrolet Performance. By reintroducing this infamous aluminum big block machined to blueprinted specs, Chevrolet Performance has made it possible for today's mere mortals to experience the ZL1's pure power and tremendous torque.

    Specifications
  • 356-T6M Aluminum Block
  • Tested to 650 Horsepower
  • Standard Deck Height (9.800'')
  • 4.240'' Finished Bore (4.300'' Maximum Bore, 4.375'' Maximum Stroke)
  • Steel 4-Bolt Main Caps Splayed 16° on the Three Center Mains
  • 2-Piece Rear Main Seal
  • Use Mark IV-type Front Timing Cover
  • Provision for Hydraulic Roller Camshaft
  • Siamese Cylinder Walls
  • Centrifugally-spun Cast Iron Cylinder Sleeves
  • Use Replacement Sleeve #809-12480035
  • -AN O-Ring Oil and Water Plugs

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