The GM Performance 427ci V8 is one of 427 examples produced to commemorate the RPO ZL1 engine that was available in 1969 and features an aluminum block. Factory-rated output was 430 horsepower and 444 lb-ft of torque. It was installed in 2011, and the exhaust manifolds were extrude honed and coated by Kennemetal.A GM Performance Certificate of Authenticity lists engine specifications and production information. The removed valve covers are also included in the sale.Power is sent to the rear wheels through a four-speed manual transmission, a 3.73 Positraction rear end is equipped.Instrumentation includes a 140-mph speedometer, a tachometer, and an analog clock.The five-digit odometer shows 2,000 miles, which represent the miles traveled since the refurbishment.