The COPO 427 for A Stock competition 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 ZL-1 all-aluminum 427 big-block that helped forge the COPO legacy in 1969.
Chevrolet Performance "Ceramic Ball" high-rpm hydraulic roller tappets
3/8" diameter LS7 pushrods
1.8:1 ratio LS7 rocker arms with roller trunions
PSI "Max Life" beehive valve springs
Hardened steel spring seats
Lightweight steel retainers
Fully CNC'ed aluminum cylinder heads — based on LS7
275 cc nominal intake port volume
89 cc nominal exhaust port volume
70 cc nominal combustion chamber volume
Del West titanium intake valves — 2.205" head diameter x 7mm stem
Lightweight sodium-filled exhaust valves — 1.615" head diameter x 7mm stem
Fel-Pro Performance multi-layer steel head gaskets with raised cylinder sealing bead
Internal wet sump oil pump
Deep-sump cast aluminum oil pan —
Billet electric water pump
Chevrolet Performance/Holley "Hi Ram" intake manifold
Whipple billet throttle body — 102mm blade
ENGINE CONTROLS & IGNITION:
Production LS7 ignition coils
Production LS7 secondary wires
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