General Category > Quadrajet Carb Talk and Tips

Oldsmobile 70-74

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mcx:
Hello Cliff...I was curious why Oldsmobile would drill the primary throttle blades when it already has a idle air bypass circuit?...everyone i see on EBay has those holes drilled added to the blades.

Cliff Ruggles:
Not sure why.  Some Pontiac Ram Air carbs also have drilled throttle plates.

I prefer to add idle bypass air with the bypass system vs drilling the plates......Cliff

mcx:
...yeah, this carb 7043252 has the base plate idle bypass at .059" and the throttle plates drilled at .111"
...I keep searching EBay for a cheap early 70s Pontiac version just so I  can have one to compare..soon enough.

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