The 1969 Chevrolet Camaro ZL1 was rated at 430 horsepower.
That figure applied to the ZL1’s official gross horsepower rating at 5,200 rpm. The ZL1 was an all-aluminum 427-cubic-inch V8 installed through Chevrolet’s COPO ordering system, making it one of the most specialized and expensive Camaro options of the era.
The engine was closely related to Chevrolet’s racing-oriented big-block family and used lightweight aluminum construction to reduce mass. Chevrolet paired the package with heavy-duty cooling, a special hood, reinforced components and performance-oriented drivetrain equipment.
The 430-hp number can cause confusion because period horsepower measurements were not the same as modern SAE-net ratings. In an installed production configuration, the engine produced a lower SAE-net figure, while testing with freer-flowing exhaust and tuning could reveal considerably greater potential. Only 69 ZL1 Camaros were produced, making the model exceptionally rare.