ZL1 Aluminum Big Block

12370850
Your Price: $5,828.48

Suggested Retail:  $6738.43

ZL1 Aluminum Big Block
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Product Details


ZL1 ALUMINUM BIG-BLOCK
ZL1 was the legendary regular production option (RPO) code that struck fear into all competitors who came up against 1969 Camaros – and a couple of Corvettes – that were equipped with this fearsome 427-cubic-inch Big-Block from the factory. The price to own an original ZL1 has exceeded the value of many homes, but you can build your own ZL1-powered supercar thanks to Chevrolet Performance. By reintroducing this fabled aluminum Big-Block, Chevrolet Performance has made it possible for mere mortals to experience the raw horsepower and tremendous torque of the ZL1. The Chevrolet Performance ZL1 aluminum block is made from premium materials and is precision machined to blueprinted specifications.

ZL1 Aluminum Big-Block
• 4.240" finished bore
• 4.300" max bore
• 4.375" max stroke
• Use sleeve P/N 12480035
• 2-piece rear main seal
• Uses Mark IV front timing cover

Specs:
Part Number: 12370850
Casting Number: 3946053
Deck Height: 9.800"
Fuel Pump Boss: Yes
Cylinder Wall: Siamese
Bore Range: 4.240" - 4.300"
Main Bolt: 4
Main Bolt Degree: 16°
Cap Material: Steel
Crank Journal Diameter : 2.750"
Oiling: Wet
Seal Type: 2 Piece
Max Stroke: 4.375"
Weight (lbs): 110
Max HP: 650
Usage: Pro

NOTE:  Requires cam bearings P/N 12499434