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ZZ427 Anniversary - 430 Aluminum Big Block Chevy Rat

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 a retooled version of the ZL1 aluminum block using the exact same tooling that helped create this legend in 1969. The advantage of the aluminum block is that it offers the completed engine the weight of a small block with a whole lot more power. The block offers a full-strength structure including 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 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 feeds the heads with the help of an 870 cfm carburetor. The camshaft is a hydraulic roller with valve lift numbers of .510-inch on the intake and .540-inch 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.

With a full list of features, this modern ZL1 is one of the most exclusive big block crate engines ever offered by GM Performance Parts. But, we didn't stop with just a great engine! 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. To document the rarity of this engine, GM Performance Parts 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. Only 427 of these crate engines will ever be produced, and then the ZL1 tooling will be retired forever. We hope that you will be one of the elite hot rodders to celebrate the anniversary of the big block Chevy with GM Performance Parts.

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.

ZZ427 Anniversary - 430 HP TECH SPECS:
Engine Part No: 19166392
Balanced: Internal
Block Type: Cast Aluminum 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 rods Part Number: 10198922
Connecting rods Type: Forged steel
Crankshaft Part Number: 19171620
Crankshaft type: Forged steel
Cylinder heads Part Number: 12363390
Cylinder heads Type: Aluminum oval port, 110cc chambers
Displacement (cu in): 427 cu in
Distributor Part Number: 93440806
Distributor Type: HEI type
Engine type: Aluminum Chevy Big Block V-8
Flexplate Part Number: 12561217
Flexplate size (in): 14
Ignition timing: Base 8 degree BTDC, 36 degree Total
Maximum recommended RPM: 6000
Pistons 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 Anniversary engine

Part #: 19166392

ZZ 427 Anniversary Crate Motor

ZZ427 Anniversary 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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