The Classic  L88 427 Updated for the21st Century 
Between 1967 and 1969, the legendary L88 was the ultimate expression of Chevy’s Big-Block power, combining a rigid iron cylinder block with lightweight aluminum cylinder heads and a single four-barrel carburetor. That raspy rat engine was rated at 480 horsepower, although the figure was generally thought to be on the conservative side.

Chevrolet Performance has recreated that classic Big-Block combination in the Z427/480 — including the 480 horsepower rating (and it just might be a little on the conservative side, too). Like the original, it features a forged steel crankshaft and high-flow, oval-port aluminum cylinder heads. 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, too.

Whether you’re building a ’69 COPO Camaro resto-mod tribute, a modified mid-year Corvette, or a street-tire class winner, the ZZ427/480 is the heritage-inspired crate engine that delivers the performance that built the Big-Block’s legendary reputation.

ZZ427/480 TECH SPECS
Part Number:19331572
Engine Type: Chevy Big Block V8
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
Camshaft Type (P/N 12366543): Hydraulic Roller
Camshaft Lift (in.): .527 Intake / .544 Exhaust
Camshaft Duration (@.050 in.): 224° Intake / 234° Exhaust
Cylinder Heads (P/N 19211799): Aluminum Oval Port, 110-cc Chambers
Balanced: Internal
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
Distributor (P/N 19212081): HEI Type
Carburetor (P/N 19170093): 770-cfm
Water Pump (P/N 19168602): Aluminum Short Style
Spark Plugs and Wires: Included|
Flexplate (P/N 12561217): 14"
Recommended Fuel: 92 Octane
Ignition Timing: Base 10° BTDC, 36° Total
Maximum Recommended rpm: 6400

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. See page 323 for a listing of manual transmission flywheels offered by Chevrolet Performance. Requires flywheel designed for internally balances engines.
• Designed for pre-1976 street vehicles or any off-road vehicle
• Not intended for marine applications

ZZ427 Warranty Detail PDF