Might as well give it a try...............
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| interchangeability of idle needles among makes of carbs? https://slantsix.org/forum/viewtopic.php?t=21444 |
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| Author: | rock [ Mon Jan 15, 2007 4:01 pm ] |
| Post subject: | interchangeability of idle needles among makes of carbs? |
Hi folks, Because we usually entertain carburetor questions in this section , I am asking here, burt if moderator moves, that is fine with me. I rebuilt a Rochester 4GC (the small mid 60's buick v6 4bbl) just because I had it and because I like building carbs and tossing em in the vat. I found this one had an idle screw so grown in it finally twisted in two. So I got to drill and tap the throttle body and luckily the needle part fell right out and the body was not damaged. I dug into the thermoquad and its kinfolk bodies in the parts pile and found numerous idle screws that measure the same thread (10-32), have the same length and most have a taper pretty close to the one in the 4GC that was undamaged. It seems to me that if an idle screw will fit in the tapped hole and will completely seal the tiny hole into the body, that idle screw should substitute for an original. Am I wrong? rock '64d100 |
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| Author: | emsvitil [ Mon Jan 15, 2007 4:15 pm ] |
| Post subject: | |
Might as well give it a try...............
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| Author: | DusterIdiot [ Mon Jan 15, 2007 5:43 pm ] |
| Post subject: | Maybe...but not always.. |
Quote: Am I wrong?
It would help to have a copy of the screw end so you can see how the "point" is tapered since it can't seal if it can't seat correctly...I do know in the case of the "reverse idle screw" and emissions era Holley's they use a "blunt"nose idle screw in the metering block instead of the pointed screw in the performance metering block use of one type vs. the other causes some "mayhem" when tuning the idle and transition circuit for those carbs. It would not suprise me that a TQ screw is the same as the Rochester Screw since Carter for a short while did make Rochesters in their Factory (during the nasty "strike" years in the early 70's at GM...there are quite a few QuadraJets marked "Made by Carter" out there).Something to think about, -D.Idiot |
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