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Yenko used two copo # which are famous to gear heads like myself.......9561 which is the solid lifter L-72 big block making 425hp. 201 were produced. The more famous one 9560 which was used by Gibb chevy dealer for drag racing conceived by race legend Dick Harell for super stock NHRA. The engine was an all aluminum 427 called the ZL-1 which cost an extra $4,00 dollars and was rated at a modest 430hp but really made almost 500 hp. Only 69 were ever produced. That's what I recall. COPO was a fleet use ordering procedure for taxi's rental fleets and cop cars. These two popular dealers (Yenko and Gibbs) new people on the inside to add these twoo COPO #'s to the ordering form to get what they wanted. This trend started in '69. Yenko was putting big blocks in the camaro before '69 as dealer installed options. I praise these two noble gear heads as genuises for their devotion to tire shredding camaros.
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