ZZ427 - 430 Big Block Chevy Rat

There are few engines that conjure up images of greatness like the 427 Chevy big block. New to the GM Performance Parts lineup, the ZZ427 big block crate engine brings back all of the good things that you remember about the 427 with a few modern new upgrades. With an updated cast iron block, a 9.5:1 final compression ratio, and an aggressive hydraulic roller camshaft, the ZZ427 offers you outstanding performance while still living on low octane fuel.

The legendary 427-inch big block Chevy powered some of the most storied cars in the history of the high performance automobile. This latest version holds true to that tradition, offering you a tough, 4-bolt main cast iron block with all a forged internal rotating assembly. The top half of the engine is that same as the limited edition Anniversary 427 crate engine: oval-port heads that use 2.19-inch intake and 1.88-inch exhaust valves work with 1.7:1 aluminum roller rockers and a .510-inch intake/.540-inch exhaust camshaft. The intake is a matching, high-flow oval-port aluminum piece that gets fed the air/fuel mix from a 870 cfm carburetor. An HEI distributor, aluminum water pump, spark plug wires, and a 14-inch flexplate round out the package. Internally balanced, the ZZ427 will spin to 6000 rpm before it's time for you to shift.

The ZZ427 is an exciting trip back to one of the highpoints in the history of the Chevrolet big block. With a conservative 430 horsepower and loads of torque, it's still one of the best crate engines for just about any big block application.

Check This Out

• 430 horse
• Pump gas friendly
• 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!