The COPO 9561 Program is the base Camaro sports coupe converted specifically by Yenko Chevrolet, including the 427 cubic inch, 425-horsepower, iron-block engine.
The new 572-cubic-inch engine carries over the spirit of the original 1969 COPO Camaro,
a purpose-built dragster created by dealers using the central office production order system to outfit cars with the larger Chevrolet V-8.
While a big-block V-8 displacing 572 cubic inches is an option, his COPO Camaro was offered with the smaller LSX-based engines.
If those statistics hold true for its track-only COPO Camaro,
the big-block Camaro will sit atop a 5.7-liter V8 with 580 horsepower (433 kW) of supercharged power, which is also offered.
The aluminum 427 ZL1 engine weighs roughly 100 pounds less than the 396 cubic inches of iron-based big-block offered in the Camaro,
and produces more power to boot, making it a popular choice at drag strips.
This internal order of stock helped to get around the limitation Chevy placed on Chevy to offer engines under 400 cubic inches only in the Camaro.