paint code for petty blue

B3 is it.

Interestingly enough though, actual Petty Blue used by Petty Enterprises (or whatever they are now) is a few shades off from mopar Petty Blue/B3.

A friend of mine built a '66 Petty Belvedere Replica and went thru Petty Enterprises to get permission to do it. They wouldn't approve it unless he got the decals thru their supplier and they also told him their blue paint code is copyrighted, but gave him the closest commercially available code. Their are lots of Petty Replicas out there, but very few officially approved ones....meaning they can't sue him for using the 43.