Copo 427 425 HP
The COPO 427 uses the large-bore cylinder block and high-flow cylinder heads of the LS7 engine and complements them with a high-compression rotating assembly to deliver big power from its large displacement. Its lightweight aluminum block and heads revive the spirit of the original ZL1 all-aluminum 427 big-block that helped forge the COPO legacy in 1969.

427 TECH SPECS

Displacement: 427 cu in (7.0L)
Compression Ratio: 13.5:1
Cylinder Block: LS7 Cast Aluminum
Bore x Stroke (in): 4.125 x 4.000
Crankshaft: Forged Steel
Connecting Rods: Forged Steel
Pistons: Forged Dome
Cylinder Heads: LS7 Aluminum
Induction: Natural
Intake Manifold: Holley Hi-Ram
Camshaft Type: Hydraulic Roller
Camshaft Lift (int./exh.): .630/.630-inch
Camshaft Duration (int./exh.): 233/276 deg. @ .050-inch

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