Big Block Crate Engine - ZZ427/480 Deluxe

The legendary L88 was the pinnacle of Chevy’s Big-Block power, and the ZZ427/480 crate engine carries that spirit with modern updates that enhance performance, making it the ultimate expression of Chevy heritage for your classic Corvette.

Like the original, our ZZ427/480 combines a sturdy iron cylinder block with lightweight aluminum cylinder heads and a single four-barrel carburetor. That raspy crate engine was rated at 430 horsepower, although the figure was generally thought to be on the conservative side. We’ve upgraded the camshaft from the original’s mechanical flat-tappet design to a smoother hydraulic roller, which delivers great drivability characteristics and a broader rev range. A 10.1:1 compression ratio means it will perform great on pump gas.

TECH SPECS

• Part Number: 19331572
• Engine Type: Chevy Big-Block V-8
• Displacement (cu in): 427
• Bore x Stroke (in): 4.250 x 3.750
• Block (P/N 19170538): Cast iron with 4-bolt main caps
• Crankshaft (P/N 19171620): Forged steel
• Connecting Rods (P/N 19211226): Forged steel
• Pistons (P/N 19171618): Forged aluminum
• Intake Manifold (P/N 12363406): Dual plane
• Carburetor (P/N 19420445): 770-cfm
• Camshaft Type (P/N 12366543): Hydraulic roller
• Valve Lift (in): .527 intake / .544 exhaust
• Camshaft Duration (@.050 in): 224° intake / 234° exhaust
• Cylinder Heads (P/N 19331423): Aluminum oval port, 110cc chambers
• Valve Size (in): 2.190 intake / 1.880 exhaust
• Compression Ratio: 10.1:1
• Rocker Arms (P/N 19210726): Aluminum roller-style
• Rocker Arm Ratio: 1.7:1
• Water Pump (P/N 19168602): Aluminum short-style
• Recommended Fuel:Premium pump
• Distributor: Billet HEI type
• Spark Plugs and Wires: Included
• Ignition Timing: 36° Total @ 4,000 rpm
• Maximum Recommended rpm: 6,400
• Balanced: Internal
• Flexplate (P/N 12561217): 14"

INSTALLATION NOTES

• Due to crate fitment, the carburetor is shipped in a separate box and needs to be installed by an engine installer
• Requires addition of starter and fuel pump (not included)
• Clutch linkage bosses are drilled and tapped. When using cast-iron exhaust manifolds, lower head bolts may need to be replaced with bolts with shorter heads, for clearance
• Comes with an internally balanced 14" automatic transmission flexplate, requires flywheel designed for internally balanced engines
• Not intended for marine applications