Chevy ZZ427 Anniversary - 430 Aluminum BBC

GMPP ZZ427 engines are a throw-back to the muscle car era where big blocks ruled the strip. GM had some legendary rat motors and this one is on its way to legend as well. Chevrolet's 1969 ZL1 was the inspiration for the new anniversary edition 427. Using the same tooling as the ZL1, GMP cast the same aluminum block that delivered bullet proof performance. ZZ427's boast 430 horsepower, but may actually be under rated.

GM Performance starts with that L88 aluminum block. Aluminum engine blocks are obviously much lighter, giving a tremendous advantage. The less a race car weighs, the faster it is - simple! 427 anniversary engine blocks are superiorly strong and include thick deck surfaces with 4-bolt mains. Stuffed into the aluminum 427 block is a forged steel crankshaft, forged steel rods and forged aluminum pistons for a 9.5:1 final compression ratio. Aluminum, oval port heads have a 110 cc combustion chamber and carry 2.19-inch intake and 1.88-inch exhaust valves. A matching, high-flow aluminum oval-port intake manifold feeds the heads. Capping off the intake is an 870 cfm carburetor. The hydraulic roller camshaft provides .510-inch lift on the intake and .540-inch lift on the exhaust. GMP added 1.7:1 ratio aluminum roller rockers.

This is one rare engine and a super performer! Only 427 of these Anniversary engines will ever be produced. To document the rarity of this engine, GM Performance will include a complete owner's kit with each of these engines. In that kit, you'll find 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.

Check This Out

• ZL1 Heritage
• Aluminum Block
• Limited Production
• 24-month GMPP warranty

*Applications have not been validated. They are merely suggestions of how you might enjoy your GM Performance Parts crate engine. Some applications may affect engine warranty. See specific warranty information. Some applications may not be emission legal; check state and local ordinances.

Installation Notes

• Clutch linkage boss is cast and machined in 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.
• Requires addition of starter and fuel pump (not included).
• Gen VI tall-deck block has machined mechanical fuel pump boss
• Requires internally balanced flywheel for manual transmission applications.
• Intended for pre-1977 street vehicles and all off-road vehicles.
• Not intended for marine applications.
• Big, sticky slicks will help hook up this monster!