1966 Hollow Stud Tri-power Engine Compartment These are the air cleaners

These are the air cleaners studs for the large 1957 air cleaner

heat from the motor is absorbed into the carburator

fuel block for front carb

( not added with two screws like some do)

or newer Pontiac 2 bbl with the "taller" airhorn

1966 Hollow Stud Tri-power Engine Compartment These are the air cleanersExcellent exact reproduction. This is not the repro hollow stud other carry. Even has the correct bevel on the edge of the nipple, silver zinc plated.. Should be located in the center carb position, passanger side, rear. Used on GTO with air and all full sized cars supplying vacuum to heater controls. Some add this stud to supply vacuum for vacuum gauge.