ZZ427/480 TECH SPECS:

• Engine Type: Chevy Big-Block V-8
• Displacement: 427ci
• Bore x Stroke: 4.250' x 3.750'
• Block: Cast-iron with four-bolt main caps
• Crankshaft: Forged steel
• Connecting Rods: Forged steel
• Pistons: Forged aluminum
• Camshaft Type: Hydraulic roller
• Camshaft Lift: .527' intake / .544' exhaust
• Camshaft Duration (@.050 in.): 224° intake / 234° exhaust
• Cylinder Heads: Aluminum oval port, 110cc combustion chambers
• Valve Size: 2.190' intake / 1.880' exhaust
• Compression Ratio: 10.1:1
• Rocker Arms: Aluminum roller style
• Rocker Arm Ratio: 1.7:1
• Distributor: HEI type
• Carburetor: 770-cfm
• Water Pump: Aluminum, short-style
• Spark Plugs and Wires: Included
• Flexplate: 14' diameter, internally balanced
• Recommended Fuel: 92 octane
• Ignition Timing: Base 10° BTDC, 36° Total
• Maximum Recommended RPM: 6400
• Balanced: Internal

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
• Designed for pre-1976 street vehicles or any off-road vehicle
• Not intended for marine applications
• Distributor with melonized steel gear MUST be used with long-blocks and partial engines with steel camshafts, or engine damage will occur.

Emissions Note:

This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.

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