Quote:
Originally Posted by chrisp
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.
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It was in a different lifetime (maybe 1975 or so), so I do not remember the exact words; however:
I asked about these to a Rochester engineer (who had heard the question before
) and he told me: (a) the vents relieve excess pressure in the throttle body area under hot idle and slow running conditions thereby alleviating an over-rich condition, and (b) the vents connect to a "dead" area in the throttle body, so virtually zero air would ever enter the carburetor, only exit.
If someone has a new old stock Rochester carburetor kit from the early 1960's (I junked all of mine); one will find, in addition to the adjustment sheet, a small yellow sheet stating something to the effect "the gaskets in this kit are correct, use them". I guess Rochester got a few inquiries early on.
Jon.
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