Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

Pontiac 400 - Idle bypass and Secondary rod hanger questions

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77cruiser:
Take a look at the IABP make sure it's not blocked by the gasket some place, not likely but ya never know.

DieselPower:
Gasket alignment is good.

429bbf:
dp i had the same problem with a 400 . it was to rich at idle i end up with .037 idle tube and .052 dcr. i know every engine is different and the guy told me he had a bigger cam than what he had. its so hard to build something when they don't know exactly what they have. hth

DieselPower:
How big can I make this bypass?  I am tempted just to take it to .130" and see how it runs.  If that is not enough, maybe .140".  I have seen Cliff say that he never has to go over .120", but I do not see how that is possible unless he added holes in the throttle blades.  Is there any reason not to make the IAB .130" or even .140" if it gets the blades where they need to be so I am not running off of the transition slots?

Any thoughts on my questions about the secondary hangers and power piston bore in my original post?

Thanks guys!

77cruiser:
Start at .125 I had one at .14 & it whistled at idle. You can always close it back down by using drilled 1/4 inch  set screws to restrict the vertical passage in the baseplate.

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