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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 Block Technical Notes:
• 356- T6M Aluminum block
• Standard deck height (9.800")
• 4.300" maximum bore
• 4.240" finished bore
• 4.375" maximum stroke
• Siamesed cylinder walls
• Centrifugally spun cast-iron cylinder sleeves
• Steel 4-bolt main caps splayed 16° on the three center mains (dowel located)
• Provision for hydraulic roller camshafts
• AN O-ring oil and water plugs
• Tested to 650 horsepower
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