COPO ZL1 with the yenko performance pakage.

[William]

There is no reason to believe Yenko Chevrolet or Yenko Sportscars Inc was involved with any of the 69 factory-built ZL1 Camaros. When Chevrolet took back many of the cars from Fred Gibb Chevrolet [June '69] they were shopped around to dealers specializing in high-performance cars. Yenko certainly could have acquired some but by that time had many unsold COPO cars of his own.

Yenko did take over production of the ZL1 block casting after the 1969 model year.