Re: COPO?
 

The car was on e-bay and has recently ended/sold. I wasn't able to see the car so I guess we'll never know. All I had to go by were photos of the car. I can't understand why the car would have had a big block heater core unless someone changed it from small block to big block during its life, or changed the vin and trim tag? Here's a link to the ended auction.
X11 Big Block

Here is another X11 big block that I haven't been able to get any information on. Anybody in Virginia that can take a look?

X11 Big Block #2

Mike

Re: COPO?
 

Both cars have drum brakes. (power discs standard on COPO) It's unlikely they are anything more than cars that have had a big block added later on... The big block heater core was likely added for the same reason GM did it, because a small block one doesn't fit too well and mashes the heater hoses between the firewall and cylinder head if its not changed. Yeah, the discs could have been removed for a full drum brake setup, but thats usually very unlikely. I've seen heater cores swapped out to accomodate a big block swap alot more often than I've seen a full power disc setup scrapped in favor of 4 wheel drums. Anyone ever drive/stop a 69 Camaro or chevelle with 4 wheel manual drum brakes? It aint fun. https://www.yenko.net/ubbthreads/imag...lins/smile.gif

Re: COPO?
 

Also, shouldn't a Big Block car have a 12 bolt rear end? Neither one of these have that.

Re: COPO?
 

Yep, but rears, just like engines... often times never survive 35 years in the same car. Either one COULD be worth looking into just to be sure, but I have serious doubts either car is a COPO.