1/4" Phenolic Insulator kit 1957-58 New bases are fitted with

New bases are fitted with new shafts

It is also a good match being aluminum if you are going to use a 1966 after market aluminum intake or the Trade Wind intake and leave natural

using an earlier Pontiac 2 bbl with no provisions for choke pull-off

00 and foams $68

1/4" Phenolic Insulator kit 1957-58 New bases are fitted withThis kit also fits the popular 348s, and Olds J 2 as well as the Early Pontiac's. If your tripower has three small Rochester carbs, this fits. Kit includes three precision cut insulators, set of 12 studs and new, plated nuts. Studs are made for this application not a generic piece. Studs have the correct 5 16 18 threads into intake and 5 16 24 up on top. Kit includes 6 gaskets, which you will need. Solves issues with fuel boiling in the bowls,