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Chevrolet Performance ZL1 Aluminum Engine Blocks 12370850

Chevrolet Performance 12370850 - Chevrolet Performance ZL1 Aluminum Engine Blocks

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Engine Block, Aluminum, 4-Bolt Mains, 4.240 in. Diameter Bore, 2-Piece Rear Main Seal, Chevy, 427, Each

Estimated Ship Date: 11/6/2014 (if ordered today) Would you rather pick it up? Select Location

  • Order this item and get free delivery and handling on your entire order! Truck freight fees also waived on this item. Valid on orders shipped in the contiguous United States.

Manufacturer's Part Number: 12370850
Summit Racing Part Number: NAL-12370850

Main Journal Type: OEM
Engine Block Style: Aftermarket
Deck Height (in): 9.800 in.
Cylinder Bore as Shipped: 4.240 in.
Cylinder Bore Diameter: 4.250 in.
Engine Block Material: Aluminum
Main Bolt Style: 4-bolt
Main Caps Included: Yes
Main Cap Material: Steel
Main Cap Fasteners Included: Yes
Main Bearings Included: No
Rear Main Seal Style: 2-piece
Finished Cylinder Bores: Yes
Raised Cam Location: No
Cam Bearings Included: No
Freeze Plugs Included: Yes
Quantity: Sold individually.
In-Store Pickup: Choose In-store pick-up (OH, GA, NV) on our web site.

These Chevrolet Performance ZL1 aluminum engine blocks feature an improved design of one of the rarest production engines ever built--the ZL1 aluminum big block used in 1969 Camaros and Corvettes. They feature a new casting made from 356-T6M aluminum alloy and have a 4.240 in. cast iron liner that can be bored to 4.300 in. The engine blocks allow for crankshafts with a maximum stroke of 4.375 in. and held in by 4-bolt splayed steel main caps.

Other highlights include:

* Thread-in freeze plugs with O-ring seal
* 2-piece rear main seal
* Provisions for wet or dry sump oiling systems
* Provision for mechanical fuel pumps
* Compatible with all types of cylinder heads


Some parts are not legal for sale or use in California on any pollution-controlled motor vehicles

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