Quote:
Originally Posted by pfilean
I have a copy of a Rochester bulletin dated 1958 which notes in a Pontiac Tri Power page:
" A vented throttle body to bowl gasket is used on all three carburetors to vent any fuel vapors which may form in the carburetor bores to the outside atmosphere. This feature greatly improves hot idle and hot engine starting."
Nothing is mentioned as to whether a hot idle compensator was also used at that time. But by 1959 Cadillac, Chevrolet and Oldsmobile used them and Pontiac had a hot idle compensator by 1961.
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By using the vented gaskets on all 3 carbs as stated that would allow unfiltered air to enter engine when throttle blades are open & why would the fuel vapors not just vent out the top of carbs as the end carbs have no choke & when hot the center carb choke is open ? I believe the vented gaskets may only be beneficial if carbs begin to flood as it would allow some of the fuel to exit & not all go past the throttle blades.