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Chevrolet Performance Anniversary Edition All-Aluminum ZL1 427ci/430HP Engine
The year was 1969, and the muscle car wars were in full swing. Each one of the big three had developed their own version of the ultimate high-performance big block engine. Then, GM unleashed the ZL1, the most powerful engine ever released by General Motors. Based on an exotic aluminum block, the ZL1 offered only the best components from the L88 engine including a high-compression piston, high-flow aluminum heads and intake, and a bomb-proof bottom end. To celebrate the 50th anniversary of the Chevrolet big block, Chevrolet Performance has brought back a modern version of the ZL1 for your chance to relive muscle car history.
The Anniversary Edition 427 starts with the ZL1 aluminum block using the tooling that helped create this legend in 1969. The block offers a full-strength structure, thick deck surfaces and 4-bolt mains. Building on that foundation, the short block contains a forged steel crank, forged steel rods, and forged aluminum pistons for a 10.1:1 final compression ratio. Aluminum oval port heads and matching high-flow aluminum oval port intake are paired with an 770 cfm carburetor. The camshaft is a hydraulic roller with a valve lift of .510" on the intake and .540" on the exhaust. Also has 1.7:1 aluminum roller rockers. Like the orginal ZL1, the Anniversary 427 comes grossly underated at 430 horsepower.
Once you purchase an Anniversary 427 big-block crate engine, you enter a very exclusive club because only 427 of these engines will ever be produced. A special owner's kit includes official Anniversary 427 emblems to place on your car, as well as an engine data plaque and certificate of authenticity that share a matching serial number with the valve covers!
Only 427 of these crate engines will ever be produced, and then the ZL1 tooling will be retired forever.
Engine Type: BB-Chevy Aluminum V8
Displacement: 427 ci
Bore x Stroke: 4.25 x 3.76
Block: Cast aluminum with 4-bolt main caps
Crankshaft: Forged steel
Connecting Rods: Forged Steel
Pistons: Forged Aluminum
Camshaft Type: Hydraulic roller
Valve Lift: .510 Intake/ .540 Exhaust
Camshaft Duration at .050": 211deg Intake/230deg Exhaust