[War eagle]

[QUOTE=John V.;5834543]Dick, not sure I agree or else I am misunderstanding what you are saying.

The '64 pulley set-up for A/C used a specific Balancer Assembly that was always 2 groove. Two different groove dias. were employed.

Likewise, the WP pulley was 2 groove and also employed 2 different groove dias. when e/w A/C.

I'm not aware of a '64 set-up that used a 3rd pulley for A/C.

John I think the mention of a 3rd pulley was really a 2nd rear most pulley. The a/c crank pulley used a 4 piece assembly which included the damper, a single pulley and the rear most single pulley along with the crank snout This was serviced only as an assembly. No individual pulleys, damper or snout were available. As yes, the pulleys were different size diameter as you mentioned. Just adding the single rear most pulley if you can find one, might help but those darn Pontiacs have year and use specific pulleys and can really be a problem mixing and matching. Adding an 1/8 inch of the rear pulley will push everything else out of line.