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03-25-2008, 08:16 PM
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CC Member
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Join Date: Feb 2007
Location: Austin,
TX
Cobra Make, Engine: Lonestar Classics, 302 stroked to 347; Metallic British Racing Green
Posts: 595
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Not Ranked
I did a number of holes in my Lonestar after painting, and pretty much the way you described "do my measurements, use masking tape, drill a pilot hole to start and slowly make it bigger to fit the size of the hole I need." Not that difficult, but as always, MEASURE 18 TIMES, DRILL ONCE!!
I didn't counter sink under ANY of my drilled holes, and would be wary of that. The fiberglass is not THAT thick, and I would be really nervous about judging the depth of the countersink!!!!!
If the nipple is short though, I guess you have no other options. Can you find nipples with longer threads perhaps?
Glyn
__________________
Cave magister imperitus - Beware the inexperienced teacher
"No, I DON'T have an accent, this is how English sounds when it is pronounced correctly!"
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03-25-2008, 10:03 PM
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Senior Club Cobra Member
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Join Date: May 2007
Location: San Clemente,
CA
Cobra Make, Engine: CSX 4758, CSX 381 Keith Craft 482 w/ Weber 48 IDA's
Posts: 492
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Not Ranked
Agree with Glyn....and use new or very sharp bits. Pilot holes a must.
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03-26-2008, 06:35 AM
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Renegade Nuns on Wheels
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Join Date: Aug 2001
Location: columbus,
Oh
Cobra Make, Engine: Unique 427 roadster with 351C-4B
Posts: 5,129
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Not Ranked
I spin the bits backwards, prevents the bit from lifting the gel coat.
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03-26-2008, 11:12 AM
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CC Member
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Join Date: Aug 2006
Location: San Diego,
CA
Cobra Make, Engine: SPF1715, Roush Built 434 ci Stroker, Dart Block, Ported AFR 205 Heads... 561 hp / 547 tq, Former Roush Show Car, Completed and Prepped By Olthoff Racing.
Posts: 1,066
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Not Ranked
Quote:
Originally Posted by rdorman
I spin the bits backwards, prevents the bit from lifting the gel coat.
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You can also use a counter sink bit before you drill the hole to cut away the gel and prevent it from lifting when you drill into it. This is a trick I learned from a guy that rigs custom boats. |
03-26-2008, 01:46 PM
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Senior Club Cobra Member
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Join Date: Jul 2001
Location: Evans,
CO
Cobra Make, Engine: NAF 289 FIA, 347 stroker with Weber 48's, building a '48 Anglia gasser, driving a '55 Chevy resto-rod
Posts: 3,119
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Not Ranked
Mask the area of the hole to be drilled, lay out your measurement and coat the pilot bit with silicone, drill slowly, then use a silicone spray and spray into the pilot hole, coat the next bit with silicone and make sure "All" your bits are sharp. I've used this method on my Cobra and various boats over the years.
Also pilot point bits work the best, IMO
__________________
"Breathe in... Breathe out... then move on with life. Lifes too short to sweat the small stuff"
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03-26-2008, 06:23 PM
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Senior Club Cobra Member
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Join Date: Jan 2001
Location: Santa Barbara, Ca.,
ca
Cobra Make, Engine: R.U.C.C. with a 427FE, toploader
Posts: 1,435
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Not Ranked
Quote:
Originally Posted by rdorman
I spin the bits backwards, prevents the bit from lifting the gel coat.
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That is how I did it  and it is almost as easy as drilling forward 
__________________
Mike Z
Nothing sucks more than that moment during an argument when you realize you’re wrong. 
Last edited by Ibr8k4vetts; 04-12-2008 at 10:44 PM..
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