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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.

ZZ427 - 430 HP TECH SPECS:
ZZ427-430 HP Engine Part Number: 19166393
Block Part Number: 12561353
Block Type: Cast iron with 4-bolt main caps
Bore x Stroke (in): 4.25 x 3.76
Camshaft duration (@ .050 in): 211 degree intake / 230 degree exhaust
Camshaft Part Number: 12366543
Camshaft type: Hydraulic roller
Carburetor Part Number: 19170094
Carburetor size: 870 CFM
Compression ratio: 9.5:1
Connecting Rod Part Number: 10198922
Connecting rods Type: Forged steel
Crankshaft Part Number: 19171620
Crankshaft type: Forged steel
Cylinder head Part Number: 12363390
Cylinder head Type: Aluminum oval port, 110cc chambers
Displacement (cu in): 427
Distributor Part Number: 93440806
Distributor Type: HEI
Engine Name: ZZ427
Engine type: Chevy big-block V-8
Flexplate Part Number: 12561217
Flexplate size (in): 14 in
Ignition timing: Base 8 degree BTDC, 36 degree Total
Maximum rpm: 6,000
Piston Part Number: 19171618
Pistons Type: Forged aluminum
Recommended fuel: 92 octane
Rocker arm ratio: 1.7:1
Rocker arms Part Number: 12361323
Rocker Arms Type: Aluminum roller style
Spark plugs and wires: Included
Valve lift (in): .510 intake / .540 exhaust
Valve size (in): 2.19 int / 1.88 exhaust
Water Pump Part Number: 14058915
Water pump Type: Aluminum short style

Chevy Performance ZZ427 engine image

Part #: 19166393

ZZ 427 GM Crate Motor

ZZ427 Engine dyno image

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!
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