Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

Pontiac 400 - Idle bypass and Secondary rod hanger questions

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429bbf:
I've got a 1910 that i bought for a project I've never taken it apart. on the quads the spring goes up inside i can't tell you on the 1910. your second question the thicker gasket id see how the thing performs before id change it.i would not be afraid to drill the bypass a little bigger to .130 and maybe smallen your idle tube and dcr. .ive noticed it only takes a couple .000  to make a large diff.fwiw

429bbf:
how did you get power piston down all the way if the spring doesn't go up inside? you should have bad coil bind. on the other note i reread your setup. i would drill it to .130 and make the dcr to low side of 50 and leave the idle tube alone .whats sad is you should do them 1 at a time . but that means lots of bending over in the car or lots of removal. fwiw

DieselPower:
Thank you for the replies! 

I will drill out the IAB to .130" and let you guys know what happens.

I decided not to worry about the secondary hanger.  After doing some full throttle runs and pulling the plugs and seeing that they are a perfect light tan, I am going to call it good enough.

With the power piston concern I had, if you look down into the power piston bore, you see another small bore that is obviously the vacuum source.  The thing is, that inner bore looks almost big enough to put the spring into, but not quite.  I did not experience any binding, but obviously if the spring is supposed to sit in that inner bore, my spring tension will be way off.

429bbf:
you are correct . it does not go in the vacuum source, it just sits right on top of the little hole. i was confused ,i thought you were asking about the power piston internal bore . sorry for the confusion. hth

429bbf:
on a side not ,i like your login . i used to run diesel in my 79 f250 when diesel was 30 cents . i had a 11.5.to 1 429 and i had dual tanks . i would fill the rear with diesel and front with gas . id start it on gas and when i got it warmed up going down the road id switch over . then id switch over before i shut it off. it ran pretty darn good.now i just run quads on my fords. fwiw.

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