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 1Likes
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1
Post By 68gt500
11-06-2008, 05:41 PM
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Club Cobra Member
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Join Date: Nov 1999
Location: Salem,,
NJ
Cobra Make, Engine: ERA 289 FIA #2100 Rio Red Wimbledon White Stripes 302 stroked to 331 Webers Richmond Road Race 5 speed
Posts: 782
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Not Ranked
third progression hole--Who drilled their own?
I am in the process of making a jig to drill a third progression hole in my IDA's. The only thing I am worried about is the possibility of snapping a 1mm drill bit while drilling aluminum. I plan on using some cutting oil and taking it slow to keep the drill bit from loading up. Any other sugestions?
__________________
 Snakebit
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11-06-2008, 08:47 PM
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Senior Club Cobra Member
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Join Date: May 2006
Location: Manteca,
Ca.
Cobra Make, Engine: None, sold it
Posts: 2,439
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Not Ranked
Center punch it first and then apply very little pressure. Let the drill do the work.
Terry
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11-06-2008, 09:51 PM
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CC Member
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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Not Ranked
Do not use anything other than a "Pin Vise" to drill with. Go slow and roll it between your fingers while applying very little pressure, do not allow it to bind. Do not use any sort of a power source such as "Electric or Cordless Drill". Have more than 1 bit available.
__________________
Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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11-06-2008, 09:52 PM
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CC Member
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Join Date: Feb 2006
Cobra Make, Engine:
Posts: 4,926
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Not Ranked
a ONE MILLIMETER drill bit? REALLY?
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Of course it's REAL! You are NOT imagining it!
We don't want a bigger government; We want a government that does a few BIG things, and does them right.
If you think that you can cut it, if you think you got the time, they'll only give you one chance, better get it right first time. 'Cause in this game you're playin, if you lose you got to pay. And if you make just ONE wrong move, you'll get BLOWN AWAY!
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11-13-2008, 01:32 AM
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CC Member
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Join Date: Oct 2001
Location: Linkenheim,
BW
Cobra Make, Engine: Sorry "just" a 68 Shelby GT500
Posts: 90
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Not Ranked
Yes, I did it myself.
I used the instructions I found in the net. I center punched it with a sharp punch an used a regular 1mm in my smallest drill. Went thru like butter.
Talk about a difference ! 
__________________
Mike
68 GT 500
(Germany)
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11-28-2008, 11:27 AM
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CC Member
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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Not Ranked
What symptoms were you experiencing prior to the procedure and what were the results afterwards.
__________________
Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way
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11-28-2008, 12:47 PM
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Club Cobra Member
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Join Date: Nov 1999
Location: Salem,,
NJ
Cobra Make, Engine: ERA 289 FIA #2100 Rio Red Wimbledon White Stripes 302 stroked to 331 Webers Richmond Road Race 5 speed
Posts: 782
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Not Ranked
Have not had a chance to drill them yet, still fabricating a jig.
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Snakebit
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11-28-2008, 02:42 PM
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CC Member
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Join Date: Nov 2008
Location: Seattle,
WA
Cobra Make, Engine:
Posts: 4
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Not Ranked
I did the mod and it ruined my carb. I used a 1/16" bit and it was too big causeing a huge vacuum leak at idle and basically shutting off my idle circut. if you're going to do it make sure both holes are in the exact same posisition, and you use a 1mm bit. As I further researched it there are hundreds of horror stories of ruined carburetors form doing this mod incorrectly. I'm in the process of trying to find a way to plug the additional holes now.
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11-28-2008, 04:24 PM
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CC Member
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Join Date: Jul 2002
Location: Greenville,sc,
SC
Cobra Make, Engine: Kirkham 427 (KMP 266); CAV GT40
Posts: 1,464
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use two part epoxy. I like the kind that comes in the stick. Push it in the hole from the inside of course, and it can then be sanded lightly down to the contour of the throttle body
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SPF Daytona coupe 055, Roush 427R
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11-28-2008, 04:55 PM
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Senior Club Cobra Member
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Join Date: Sep 2002
Location: Montgomery,
TX
Cobra Make, Engine: CR 427 S/C, 351W, 5 Sp & KMP142 - 427 SO, 4 Spd
Posts: 2,212
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Not Ranked
How about the famous JB Weld (here we go again!) 
Actually that is a 2 part epoxy and I have seen it used successfully
on carbs to hold a pressure fit tube - didn't dissolve or anything.
1 mm - that is small!
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Flip
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11-28-2008, 05:16 PM
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CC Member
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Join Date: Jul 2002
Location: Greenville,sc,
SC
Cobra Make, Engine: Kirkham 427 (KMP 266); CAV GT40
Posts: 1,464
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Not Ranked
that would work fine
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SPF Daytona coupe 055, Roush 427R
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01-18-2009, 04:00 AM
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CC Member
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Join Date: Jun 2003
Location: Palma de Mallorca, Spain,
ESP
Cobra Make, Engine: Contemporary with 482 KC/SO, TKO600,IRS Jag/AMP, 3.54 Salisbury PL,
Posts: 578
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Not Ranked
I plugged some 1mm holes making a thin 1mm shaft out of brass ( may be slightly conical) and press them into the holes. Break off the part sticking out and file or sand the rest off.
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Nothing sounds better than a Cobra in a Tunnel !
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