Radiator Harrison Info O A code?

[rare4k]

any one have any info on the Harrison Radiator codes A O cant find this one it was in a 66 Chevelle race car I just bought Thanks phil http://i161.photobucket.com/albums/t204/rare4k/017-1.jpg (http://s161.photobucket.com/user/rare4k/media/017-1.jpg.html)[/img]

[Mr70]

Looks to be a 1967 Buick Skylark.
Not a chevrolet code or number.

[rare4k]

wonder what kind of skylark came with a 4 core? thanks for the info MR70

[Mr70]

When heavy duty or air conditioned was ordered maybe?