The Top 5 Missing Muscle Cars of all-time

[JoeC]

Originally Posted by Kurt S

No. For 68 and earlier, it was just an RPO.
By 69, they were clamping down on the axle ratios, probably due to warranty costs. Ordering a 4.56 or 4.88 in a 69 Nova or Camaro required a COPO.

1969 Nova was different then Camaro and Chevelle , for some reason.

1969 Nova 396 L-78 power team charts show 3:55 as the high ratio RPO so COPO 9511 was needed to get 4:10 4:56 4:88

1969 Chevelle and Camaro L-78 can get 4:10 RPO but needed COPO 9511 to get 4:56 4:88

I been researching this because the found Yenko sold 1969 SS396 L-78 Novas show 3:55 ratio.

Yenko was very good with the COPO program so I believe he used COPO 9511 to get 4:10 since the Yenko 427 Nova was advertised to have 4:10 gears

I have not found paperwork that shows a Yenko Nova COPO 9511 4:10 but there is not much found on the Yenko 427 Novas