Drilling Carb butterflies....Big Cam - Team Camaro Tech
Tech 2002 General Tech questions from 2002
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post #1 of 5 (permalink) Old Jun 10th, 02, 03:33 PM Thread Starter
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Join Date: May 2001
Location: Mass
Posts: 252
Ok...as some of you know I have a big cam and a problem with my idle can't seem to get it to idle under 1000-1100rpm..And at that RPM I have the idle screw turned out so much I am no longer in the idle circuit but in my primary circuit and the primaries are dribbling fuel..It then loads up and dies...

Some of you guys have recommended drilling the butterflies..Need to know what size drill bit to start with??? Should I drill both butterflies??? Is there any particular place to drill the holes???
Thanks again

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post #2 of 5 (permalink) Old Jun 10th, 02, 04:23 PM
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Join Date: Feb 2002
Location: Ventura,Ca.
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What kind of carb. are you running? If it's a Holley, there's a screw on the bottom that can be adjusted to open the secondaries just a bit. I'd try this first... if it is a Holley. I had the same problem, this adjustment solved the problem for me. If it's an Edelbrock, I don't know if there is any other way other than to drill. I know from Holleys web site, they suggest drilling a 1/64- 1/8 hole in each of the primary throttle plates. www.holley.com/HiOctn/TechServ/TechInfo/Trblsht.html
Hope this helps. Good luck.

Bob
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post #3 of 5 (permalink) Old Jun 10th, 02, 04:35 PM Thread Starter
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Oh yeah..I forgot to mention I am running an edelbrock..Thanks for the info

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Restored 68 Camaro R/S 327 4 speed
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Restored 55 chevy Belair
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post #4 of 5 (permalink) Old Jun 11th, 02, 02:50 AM
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Mark
 
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OOps, Holley mods. Sorry.

[This message has been edited by stingr69 (edited 06-11-2002).]
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post #5 of 5 (permalink) Old Jun 11th, 02, 05:32 AM
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Bruno
 
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IMO Drill the smallest you can, I think 1/32" is small enough, 1/64" is kinda difficult to drill anyway. If not enough you will have a choice to go with a higher diameter drill.

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