LIMITED AVAILABILITY BUT WE MAY BE ABLE TO GET YOU A GREAT DEAL ON ONE IF YOU'RE INTERESTED - PLEASE CALL FOR MORE INFORMATION

The legend of the all-aluminum big-block continues. The year was 1969, and the musclecar 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 bombproof bottom end. To celebrate the 50th anniversary of the Chevrolet big-block, GM Performance Parts has brought back a modern version of the ZL1 for your chance to relive musclecar 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 870-cfm carburetor. The camshaft is a hydraulic roller with valve lift numbers of .510" on the intake and .540" on the exhaust. We even added 1.7:1 aluminum roller rockers. Like the original ZL1, the Anniversary 427 comes grossly underrated 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.

• TECH SPECS: Anniversary Edition 427
• Engine type: . . . . . . . . . . . . . . . . . . . . . . . . . Aluminum Chevy big-block V-8
• Displacement (cu in): . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 427
• Bore x stroke (in): . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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
• Camshaft lift (in): . . . . . . . . . . . . . . . . .510 intake / .540 exhaust
• Camshaft duration (@.050 in): . . . . . 211° intake / 230° exhaust
• Cylinder heads: . . . . . . . aluminum oval port; 110cc chambers
• Valve size (in): . . . . . 2.19 intake / 1.88 exhaust; stainless steel
• Compression ratio: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.1:1
• Rocker arms: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . aluminum roller
• Rocker arm ratio: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.7:1
• Distributor: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HEI type
• Carburetor: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 870 cfm
• Water pump: . . . . . . . . . . . . . . . . . . . . . . . aluminum, short-style
• Spark plugs & wires: . . . . . . . . . . . . . . . . . . . . . . . . . . . included
• Flexplate: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14-inch
• Recommended fuel: . . . . . . . . . . . . . . . . . . . . . . . . . . . 92 octane
• Ignition timing: . . . . . 8° BTDC @ 800 rpm; 36° total @ 5000 rpm
• Maximum rpm: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6000
• Balanced: . . . . . . . . . . . . . . . . . . . . . . . . . . internal

INSTALLATION NOTES
• Due to crate fitment, carburetor is shipped in a separate box and will
need to be installed by engine installer.
• Requires addition of starter and fuel pump (not included).
• Clutch linkage boss is cast into block, but must be drilled and tapped.
When using cast iron exhaust manifolds, lower head bolts may need to
be replaced with bolts with shorter heads for clearance.
• Comes with a 14" automatic transmission flexplate; use flywheel
P/N 14096987 and 11" clutch assembly for manual transmission.
• Designed for pre–1979 street vehicles or any off-road vehicle.
• Not intended for marine applications.