Only 69 were ever built — the all-aluminum ZL1 427 Camaro remains the most exotic, most expensive, and most feared muscle car to emerge from the COPO program.
When drag racers Fred Gibb and Dick Harrell convinced Chevrolet to stuff an all-aluminum 427 Can-Am racing engine into a production Camaro, the result was the ZL1 — a car so fast, so rare, and so expensive that only 69 examples were ever built, each one a rolling legend.
In 1969, General Motors' corporate ban on factory performance cars over 400 cubic inches created an unlikely loophole: the Central Office Production Order, or COPO, which allowed dealers to order non-catalogued factory options. Drag-racing dealer Fred Gibb of Gibb Chevrolet in LaHarpe, Illinois, worked with performance engineer Vince Piggins to order 50 Camaros fitted with the ZL1 427 — a dry-sump all-aluminum V8 developed for the Can-Am racing series. The engine weighed roughly 100 pounds less than the iron-block 427, improving weight distribution and front-to-rear balance.
The ZL1's specifications were extraordinary: 427 cubic inches of all-aluminum construction, a 12.0:1 compression ratio, a 780-CFM Holley four-barrel carburetor, and an official factory rating of 430 horsepower — a figure widely understood to be a deliberate understatement intended to avoid insurance and regulatory scrutiny. Actual output was conservatively estimated at 500 horsepower at 5,200 rpm with 450 lb-ft of torque. The COPO 9560 option added $4,160 to the base price of a Camaro Sport Coupe, pushing the total sticker price to approximately $7,269 — nearly twice the cost of a standard Camaro.
Total production reached just 69 units, a number that has taken on almost mythological significance among Camaro collectors. In period drag racing, ZL1 Camaros routinely ran 11-second quarter miles on street tires and 10-second passes on slicks. Today, original ZL1 Camaros are among the most valuable American muscle cars ever auctioned, frequently commanding prices well above $500,000 for well-documented examples. The car stands as the definitive proof that a factory street machine could carry full-on racing hardware from the showroom floor.
The numbers that matter, each cited to its source. Where a figure is disputed or unconfirmed we hedge or leave it out — never guessed.
All-aluminum block and heads derived from the Can-Am racing ZL1; rated conservatively at 430 hp on the order sheet to avoid insurance scrutiny — actual output widely accepted as 500+ hp. COPO 9560 option; added $4,160 to base price.
| Year | Trim | Body | Built |
|---|---|---|---|
| 1969 | Camaro ZL1 (COPO 9560) | 2-door Sport Coupe | 69 |
Numbers-matching engine, factory options, the day it was built — these are the people who can confirm what your car left the factory as. We point you to the marque authority; we never reproduce their records.