General Category > Quadrajet Carb Talk and Tips

Idle Bypass air size measurement location

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GSP7:
Where/ What location,  do you measure the Idle Bypass Air hole/passage ?

Page 94,95,96 shows several different sizes options from : none -.050- .080- .085- .106- .110 inch


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Kenth:
There are pictures and explanations on pages 29-30.
Measurements are taken in the throttle plate or blade holes.

GSP7:
Yep, that's where I measured . .106" stock hole 1980 carb , and .092" on a 1971 carb

Maybe those none, .050", .080" etc on page 94, 95 came from older 1960s carbs

Kenth:
Not necessarily. The numbers you see on these pages are examples of possible recipes depending on the application, not examples of by-pass on factory units.

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