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Old 12-20-2012, 09:05 AM   #1 (permalink)
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Default drilling for Shelby drop

David, did you say you did or did not use a step drill bit?
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Old 12-20-2012, 09:28 AM   #2 (permalink)
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I did not- Not sure how well one would work- I started with maybe 1/8 bit, drilled (remember down and back is the new position) then jumped about 3 sizes for the next hole. When you get around 3/8 or so- you will prob have to go one size at a time- ending with the big size (IIRC 17/32)

Wear gloves- I got blisters really quick
Remember drill wood fast, drill metal slow (or you'll be askin santa for new drill bits for christmas)
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Old 12-20-2012, 09:30 AM   #3 (permalink)
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A 1/8" pilot hole, followed by a 1/2" drill should do the job perfectly. Clean the burrs with a round file, and you're good to go.
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Old 12-20-2012, 09:39 AM   #4 (permalink)
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You must have really sharp drill bits or have some strong hands to jump from 1/8 to 1/2. I was surprised at how tough it was to drill.
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Old 12-20-2012, 09:43 AM   #5 (permalink)
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On 65/66 cars I would drill it 17/32", on a 67+ car i would go 1/2". The reason why I do it that way is so the control arm bolts are easier to move when shimming and adding lots of caster on the earlier cars.
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Old 12-20-2012, 10:04 AM   #6 (permalink)
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Why the difference? 64-73 uses the same 1/2" bolts. If your holes are in the right place 1/2" is fine. You can always use a round file if you're a hair off.
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Old 12-20-2012, 10:24 AM   #7 (permalink)
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Why the difference? 64-73 uses the same 1/2" bolts. If your holes are in the right place 1/2" is fine. You can always use a round file if you're a hair off.
It makes it easier to move the control arm when you are setting up the alignment having to use shims on the early cars and when you start adding more +caster, especially on a power steering car when you might want more then 2 degrees. you do not bind up the bolts in the holes. It just makes life easier for the guy doing the alignment with no downside to the slightly larger hole.
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Old 12-20-2012, 03:22 PM   #8 (permalink)
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Quote:
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It makes it easier to move the control arm when you are setting up the alignment having to use shims on the early cars and when you start adding more +caster, especially on a power steering car when you might want more then 2 degrees. you do not bind up the bolts in the holes. It just makes life easier for the guy doing the alignment with no downside to the slightly larger hole.
+1 on this. The arms will fit OK if you drill 1/2" holes, but when you have to pry them back to add shims (as you will with 65-66 cars), you (or your alignment guy) will be very glad to have the extra wiggle room.

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Old 12-20-2012, 03:24 PM   #9 (permalink)
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Did any of you use step drill bits? If not, what are the sharpest, hardest bits to use?
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Front disc brakes on

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Old 12-20-2012, 03:43 PM   #10 (permalink)
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Quote:
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A 1/8" pilot hole, followed by a 1/2" drill should do the job perfectly. Clean the burrs with a round file, and you're good to go.
Exactly what I did... not a single problem.
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Old 12-20-2012, 05:12 PM   #11 (permalink)
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? Just grab your drill bits and go to town. You're over thinking this, as I did.
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Old 12-20-2012, 05:20 PM   #12 (permalink)
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Nothing wrong with using a step drill so long as the last hole size is done with the proper sized bit, I would not use a step for that.
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Old 12-20-2012, 05:39 PM   #13 (permalink)
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Did any of you use step drill bits? If not, what are the sharpest, hardest bits to use?
I did, partially. I used a 1/8" bit for the pilot holes, then used a step bit to near 1/2", and then finished it off with a regular 1/2" bit. Going that far with the step bit made it a little hard to keep the 1/2" centered though, so you may want to stop sooner with it. I had to do just a little bit of filing after using the 1/2".
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Old 12-20-2012, 07:10 PM   #14 (permalink)
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I did, partially. I used a 1/8" bit for the pilot holes, then used a step bit to near 1/2", and then finished it off with a regular 1/2" bit. Going that far with the step bit made it a little hard to keep the 1/2" centered though, so you may want to stop sooner with it. I had to do just a little bit of filing after using the 1/2".
That's exactly what I did, I used the step drill to get close then switched over to a brand new 1/2" drill bit for the final hole. Man, that is hard steel.
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Old 12-20-2012, 08:43 PM   #15 (permalink)
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Quote:
Originally Posted by 65SSG View Post
I did, partially. I used a 1/8" bit for the pilot holes, then used a step bit to near 1/2", and then finished it off with a regular 1/2" bit. Going that far with the step bit made it a little hard to keep the 1/2" centered though, so you may want to stop sooner with it. I had to do just a little bit of filing after using the 1/2".
As did I...
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