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#1
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Sub-frame Question
Was wondering about the hole in both front frame horns....above the sway bar
It is a 3/8 nc weld nut on the inside. This is on a 72...but I suspect sub-fame was changed out. I have a 75 subframe with that hole...but checked several other 70-72'a and they don't |
#2
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You could check the date code on the subframe?
(driver side on the back at the slant of the end) Not sure what the threaded hole would be for. Possibly for factory movements/holding fixture/alignments?
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates Last edited by johnta1; 03-24-2021 at 09:08 AM. |
#3
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This is a 73 frame, looks like it has the hole, can't tell if threaded though.
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
#4
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I have a couple of 73's I haven't checked yet.....
If they have them.......It may have something to do with the new 5 mph bumper crash test for 73...on the Camero.? I seem to recall there was was some sort of tubular brace on the front end of them......... |
#5
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I "think" it is for a loop, or loom bolted on frame for the + red Batt cable to the starter on a chevy engine. Usually self tap 5/16 bolt was used, no nut on back. Firebirds in 70 to 75 could have come with a chevy engine and starter and Battery on Pass side.( yes battery tray gets mounted on pass side ) Don't see this hole or dimple on any of my 1970 frames though all mine are 400 v-8 cars.
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The Following User Says Thank You to Formulabruce For This Useful Post: | ||
#6
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I have a loose 70 frame down at work I’ll take a look tomorrow.
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#7
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Interesting.
That hole and nut are not present in the one 70 subframe I have in my garage at the moment. Curious what it might have been intended for.
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keith k 70 Trans Am RA III / T400 / Lucerne Blue / Bright Blue 70 Trans Am RA III / M20 / Lucerne Blue / Sandalwood 70 Formula RA III / M21 / Lucerne Blue / Bright Blue |
#8
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I have the subframe currently off my 70. I'll check it out tomorrow
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"Those poor souls have made the fatal mistake of surrounding us. Now we can fire in any direction" 1970 Trans Am RAIII 4 speed 1971 Trans Am 5.3 LM7 1977 Trans Am W72 Y82 1987 Grand National |
#9
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Ok......checked a few more...
Out of four 73's......one has the holes in the frame....but no weld nut. 74 and 75...both have a 3/8 nc weld nut.....as does the 72?.....in my original post.. I guess tomorrows job will be to pull the stamped #'s off the back of the frame rail......and see what they say... |
#10
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Checked my 03C 70 subframe, and no hole.
__________________
"Those poor souls have made the fatal mistake of surrounding us. Now we can fire in any direction" 1970 Trans Am RAIII 4 speed 1971 Trans Am 5.3 LM7 1977 Trans Am W72 Y82 1987 Grand National |
#11
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FWIW, four spare subframes here, 1 '70, 1 '71 & 2 '72's. No holes there in any of them.
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