Chevrolet Performance's COPO crate engines are engineered for NHRA's Stock Eliminator and Super Stock classes, offering sportman racers a range of factory-developed-and-assembled racing engines.
The 350, 396 and 427 naturally aspirated engines make a race car eligible for NHRA Stock Eliminator classes from AA/S to D/S, based primarily on weight and horsepower ratings. The 350 S/C engine makes cars eligible for AAA/S and AA/S classes. Consult the NHRA rule book at nhra.com for class and compliance guidelines.
Chevrolet Performance engineers designed and tested the engines with the same methods used to develop production engines, ensuring their performance and durability; and each engine is hand-assembled in a specially built facility.
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.
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
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