Anniversary Edition 427
The spirit of the ZL1 commemorated in our limited-edition crate engine.
It's been 40 years since a few enterprising dealer-backed racers worked
the loopholes of Chevrolet's COPO ordering system to create a handful of
factory-built 427-powered supercars that weren't found in any brochure or
order guide. And while their intent was to dominate the popular Super Stock
drag racing classes, they touched off what would become one of the colorful
chapters in the muscle car anthology.
The special cars-two Corvettes and 69 Camaros-were equipped with
an all-aluminum 427 engine dubbed the ZL1" that was largely similar in
specification to the vaunted L88 427, but with an aluminum block that
saved about 100 pounds off the cars' nose-heavy front-ends. The engine
was officially rated at 430 horsepower, but the true output was closer to
GM Performance Parts commemorates the ZL1 with the Anniversary Edition
427-an aluminum-block crate engine that mimics the original in spirit, but
with design upgrades that make it a street-friendly option for COPO Camaro
tribute projects, pro-touring street machines and ultimate-performance
Our modern aluminum cylinder block has strength-enhancing design
features, screw-in galley plugs and more. We've also elected to use a
hydraulic roller camshaft, making for smoother street operation and greatly
reduced maintenance. A 10.1:1 compression ratio allows the Anniversary
Edition 427 to drink from today's gas pumps, too.
An owner's kit included with each engine comes with a serialized number
that matches the block and valve cover numbers.