Chevy ZZ427 - 430 BBC

This ZZ427 is built on the legend of the 60's big block Chevy engines. This one is built using a cast iron 4 bolt main block with 9.5:1 compression and a hydraulic roller camshaft. The big block packages gives outstanding performance using low octane fuel to keep your cruising costs down. The 427 rotating assembly is all forged components. Up top, the oval port heads with 2.19-inch intake and 1.88-inch exhaust valves work with 1.7:1 aluminum roller rockers and a .510-inch lift intake/.540-inch lift exhaust camshaft. Completing the induction system is a matched high-flow oval-port aluminum intake that gets fed by a 870 cfm carburetor. Included is an HEI distributor, aluminum water pump, spark plug wires and a 14-inch flexplate. You can rev the 427 up to 6 grand before you shift.

ZZ427 with Cast Iron Block Applications

  • 430 horse RAT!
  • 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

ZZ427 engine image

Part #:19166393

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!