I have ran Coopers on my cars. The set of 14's that were on my GTX went bad one at a time. Over a couple of years, 3 of them broke belts. I just put some 15's on last year. We will see how they hold up.

7535180-P8200535.JPG (241 downloads)
1957 Dodge truck, Snakeskin Green with a little stroker motor. 1964 Plymouth Savoy wagon ( my new project)