Cliff's Quadrajet Parts and Rebuild Kits

General Category => Quadrajet Carb Talk and Tips => Topic started by: GSP7 on January 25, 2025, 11:39:44 AM

Title: Idle Bypass air size measurement location
Post by: GSP7 on January 25, 2025, 11:39:44 AM

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


.

Title: Re: Idle Bypass air size measurement location
Post by: Kenth on January 26, 2025, 02:45:57 AM

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

Title: Re: Idle Bypass air size measurement location
Post by: GSP7 on January 26, 2025, 08:41:26 AM

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

Title: Re: Idle Bypass air size measurement location
Post by: Kenth on January 26, 2025, 09:32:15 AM

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.