[chadk]

Originally Posted by JoeC

was the other car a 1969 Biscayne or 1968?

In 1968 you can get 4:10 4:56 and 4:88 as RPO

here is the 1968 Power Team Chart
you can see where the 1969 power team chart goes up to 3:73 but the 1968 power team chart goes up to 4:88

I have been researching this because its the same for the Novas
1968 Nova can get RPO 4:10 but in 1969 you had to get COPO 9511 to get 4:10 gears

So I think Yenko used COPO 9511 to get the 4:10 gears for the 427 Novas.

Its hard to find proof on it. You need a window sticker or factory order paperwork

I do have some Nova window strickers with COPO 9511 but not for Yenko sold cars.

I think your 1969 Biscayne would be COPO 9511 for factory 4:10 gears.

Do you have a photo of the trim tag?

Sometimes the trim tags show COPO or Special order.
May be just a dash or extra numbers or letters.

I have seen COPO or Special order police or military Biscaynes that had "MEMO" stamped on the trim tag

The other car I am referring to is a '69. I don't know if the docs are legit but i believe it is a genuine L72 car. Here is a link to it.
https://www.gaaclassiccars.com/vehic...t-biscayne-l72

Here is a pic of my trim tag which doesn't have anything unusual on it.

I am aware of the MEMO stamped '68 tags as I have a '68 Biscayne 2 dr police car and a '68 Impala convertible COPO TH350 test car that both have MEMO stamped trim tags.

Thanks