COPO 427 - NHRA Rated at 470 HP

The legendary Chevy Performance COPO Camaro program got its start nearly 50 years ago with specialty 427 engines, and the latest COPO 427 racing crate engine builds on that legacy. It is built on the LSX engine block and features a high-compression rotating assembly, highflow LS7 heads and a Holley Hi-Ram intake manifold for high-rpm power. You’ve got history on your side with the COPO 427!

COPO 427 Tech Specs

• Block: Chevrolet Performance LSX cast-Iron with steel main caps
• Bore / Stroke: 4.125" x 4.000"
• Static Compression Ratio: 13.0:1 nominal
• Crankshaft: Callies 4340 "Dragonslayer"
• Connecting Rods: Callies 4340 H-beam "Compstar" Forged Steel, 6.100" Length, .927" Pin Bore Diameter
• Bearings: Clevite "H-Series" heat-treated tri-metal rod and main bearings
• Pistons: Mahle forged 2618 alloy, Dome Top, Graphal coating, Friction-coated skirts
• Piston Rings: Mahle 1mm x 1mm x 2mm, Ductile iron top with radius molybdenum face, Plain cast-iron tapered 2nd, Chrome-plated oil rails with low-tension expander
• Camshaft: Chevrolet Performance steel billet hydraulic roller; Duration - 233° int. / 276° exh. @ .050"; Theoretical Valve Lift - .630" int. / .630" exh.
• Tappets: Chevrolet Performance "Ceramic Ball" high-rpm hydraulic roller
• Pushrods: 3/8" diameter LS7
• Rocker Arms: 1.8:1 ratio LS7 with roller trunions
• Valve Springs: Performance Springs Incorporated (PSI) "Max Life" beehive
• Cylinder Heads: Fully CNC'd aluminum LSX-LS7; Nominal Intake Port Volume - 289cc; Nominal Exhaust Port Volume - 105cc; Nominal Combustion Chamber Volume - 70cc
• Intake Valves: Del West titanium 2.205" (Head Diameter) x 8mm (Stem Diameter)
• Exhaust Valves: Lightweight sodium-filled 1.615" (Head Diameter) x 8mm (Stem Diameter)
• Head Gaskets: Cometic multi-layer steel with raised cylinder sealing bead
• Oil Pump: Internal wet sump
• Oil Pan: Fabricated Aluminum 7-quarts
• Harmonic Damper: ATI Performance Products SFI-approved "Super Damper"
• Water Pump: Meziere Billet electric water pump
• Intake Manifold/Induction: Chevrolet Performance/Holley "Hi Ram"
• Throttle Body: Whipple Industries - Billet Aluminum 90mm, Cable-actuated
• Fuel Injectors (Flow Rate): 58 lb/hr @ 58 psi with EV6 / USCAR connector
• Ignition: Production LS7 ignition coils and secondary wires