What guage sheet metal for 67 floors? - Impala Tech
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post #1 of 9 (permalink) Old 04-07-2011, 11:49 PM Thread Starter
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What guage sheet metal for 67 floors?

Hey everyone. Just a quick question: what guage was the sheet metal from the factory for '67 floors. I've recently purchased some floor pans and they came 18 guage. Was that stock?

Thanks!

Bob
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post #2 of 9 (permalink) Old 04-08-2011, 07:23 PM
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Seems a little light to me. I wpould think 14 gauge or at least 16 gauge but I really do not know. You can always measure a pice of factory tin with calipers to se what it turns out to be.

Mild steel 18 gauge should measure at 0.0478" and 16 gauge 0.0598" with 14 gauge sheet metal measuring 0.0747" thick.

Big Dave
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post #3 of 9 (permalink) Old 04-08-2011, 08:39 PM
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I don't know the true answer but I'm sure that the quality of the steel makes a difference in welding.

I think 18 Gauge might be right for the pans. My 66 seemed similar at least. I used 16 for a patch on my tunnel shifter hole and it was noticeably thicker and easier to weld without burn-through.

HOW A NOVICE REBUILDS A 66 IMPALA CONVERTIBLE:
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post #4 of 9 (permalink) Old 04-08-2011, 11:30 PM Thread Starter
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Thanks for the feedback guys... I will measure a piece as soon as I can get a decent sample and calipers.
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post #5 of 9 (permalink) Old 07-22-2011, 05:26 PM
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18 gauge is correct.

donnie
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post #6 of 9 (permalink) Old 07-22-2011, 06:20 PM
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The stampings from overseas use a metric gage not the SAE gage that Detroit used. The stuff we get as replacement panels is lighter than the original tin.

GM built these cars out of 14 gage steel up to about 1973 when they dropped down to 18 gauge to lighten the load on the smog motors and improve crunch-ability to reduce traffic deaths in head ons.

They may have been using a lighter gage steel but either they used more of it, or they boxed things in a lot more; as in a head-on crash a 1966 is no match for a smaller 2010 car (I figured because of the heavier steel it would crush the smaller newer car, but results of testing were exactly the opposite).

Big Dave

Last edited by Big Dave; 07-26-2011 at 08:59 AM. Reason: Spleleing
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post #7 of 9 (permalink) Old 07-26-2011, 12:55 AM
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Dave, The original floors in my 1965 Biscayne are 18 gauge. I have found
no 14 gauge metal in my car.

Don Meyer, Mech Engr
Florida
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post #8 of 9 (permalink) Old 07-26-2011, 09:04 AM
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I was under the impression the fenders, hood, trunk, and roof where made of sterner stuff (parts I have had to replace or cut up). The floor boards have lots of compound curves stamped into them to improve rigidity so it could have been stamped out of a lighter gage metal (and it would explain why it burns through so easily when welding on roll cages).

Big Dave
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post #9 of 9 (permalink) Old 07-26-2011, 05:17 PM
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I'm rebuilding 2 cars and 1 truck simultaniously.
The original sheet metal(floors) on all appear to be the same guage,around 18/19 guage.
64 GMC,57 BelAir and 67 Impala.
The new metal seems to be slightly thinner.All forein made.
On the Impala,the metal from the roof line to the rocker on the "A" pillar is at least 16 guage.As are the body mount supports.And the rocker panels.
Metal may start out at a certain guage,but after being hit with a 300 ton press,it will thin out in many spots,so it is very hard to measure afterwards.
Mike.
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