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Old 08-25-2019, 11:19 AM
tjs72lemans tjs72lemans is offline
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Default Radiator core support question

I'm installing the radiator core support. There is a piece I don't have and don't understand why it's needed. In the assembly manual on sheet 11E-2 it shows a nut #13 which looks to be a rectangular looking piece. Then there is an actual hex nut that sandwiches everything together. So, what is the purpose of this rectangular nut?

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Old 08-25-2019, 12:49 PM
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Is this what you’re talking about?

https://rover.ebay.com/rover/0/0/0?m...2F350932336697

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Old 08-25-2019, 01:15 PM
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If the rectangular looking piece is what UPC-WU2 shows, then that piece slides into the front frame rail/ horn and keeps the cage nut from spinning.
Photo from front of car taken behind valence.
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Old 08-25-2019, 03:23 PM
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Quote:
Originally Posted by West Coast GTO View Post
If the rectangular looking piece is what UPC-WU2 shows, then that piece slides into the front frame rail/ horn and keeps the cage nut from spinning.
Photo from front of car taken behind valence.
Agree with your first sentence. Looking at your pic, no hardware store nut & washer were used on top of the rectangle with the fwd tang. just cked my example car, a 4000 mile orig '72 Pontiac plant build.

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Old 08-25-2019, 03:46 PM
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Post a picture of what your talking about? Is it on the core support or part of the core support bushings?

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72 lemans,455 e-head, UD 255/263 solid flat,3.73 gears,,,10" 4400 converter,, 6.68 at 101.8 mph,,1.44 60 ft.2007
(cam 271/278 roller)9"CC.4.11gear 6.41 at 106.32 mph 1.42 60 ft.(2009) SOLD,SOLD
1970 GTO 455 4 speed #matching,, 3.31 posi.Stock manifolds. # 64 heads.A factory mint tuquoise ,69' judge stripe car. 8.64 @ 87.3 mph on slippery street tires.Bad 2.25 60ft.Owned since 86'
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Old 08-25-2019, 04:20 PM
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# 13


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Old 08-25-2019, 04:36 PM
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I replaced the original core support mounts on my 70 GTO and there was a small metal clip holding the rubbers together. Kind of like the metal clips you see holding brake drums on that's on like one wheel stud,,,, temporarily holding things together during assembly. I think they purposely made the clip look big in the picture as far as proportionlly cause you wouldn't be able to distinguish it. I have a original stack of bushings still on the bolt that still has this retaining clip. Really not needed. I can take some pics if it helps.

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72 lemans,455 e-head, UD 255/263 solid flat,3.73 gears,,,10" 4400 converter,, 6.68 at 101.8 mph,,1.44 60 ft.2007
(cam 271/278 roller)9"CC.4.11gear 6.41 at 106.32 mph 1.42 60 ft.(2009) SOLD,SOLD
1970 GTO 455 4 speed #matching,, 3.31 posi.Stock manifolds. # 64 heads.A factory mint tuquoise ,69' judge stripe car. 8.64 @ 87.3 mph on slippery street tires.Bad 2.25 60ft.Owned since 86'
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Old 08-25-2019, 04:45 PM
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You are correct. The captured nut was rusted to the original bolt when I replaced the core support and unusable so I used a hardware store nut and washer. BTW, since there was no 71 GTO core supports out there, I also replaced the top cap from my original support and re-spot welded it onto the new 72 support. Not a matching numbers car.
Quote:
Originally Posted by 'ol Pinion head View Post
Agree with your first sentence. Looking at your pic, no hardware store nut & washer were used on top of the rectangle with the fwd tang. just cked my example car, a 4000 mile orig '72 Pontiac plant build.

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Old 08-25-2019, 09:42 PM
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OK, the blown up pic looks a bit different. I thought the top hole in the frame in pic was a nut. I do have the thick square tongue nut assembly less the u nut if you will. So the u nut slips over the thick square tongue nut assembly? It shows that u nut piece on bottom of frame rail and not inside where it would clamp when tightened. Very confusing. I then need to source the two u nuts to slide over my thick square tongue assembly. Or, one could just use a washer and nut if they wanted, correct?
Thanks for everyone's help.

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Old 08-25-2019, 09:50 PM
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The thick square tongue part has a threaded hole in the center. You don’t need the u- nut. The ones Ames sell come with the u nut because they are cheesy Repops where the thick square part is washer thin so it can’t be threaded like the thick original.


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Old 08-25-2019, 11:18 PM
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The # 13 part is just a thin retaining" nut". If you look at the large silver washer, the #13 nut slides down the bolts threaded shaft and sits on the silver washer, holding it together. The #13 nut is sandwiched between frame and large silver washer.I'll take a pic tomorrow of my original setup and you'll see the thin, sheet metal nut and what it does. You won't use one putting it back together,,or you don't have to.
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72 lemans,455 e-head, UD 255/263 solid flat,3.73 gears,,,10" 4400 converter,, 6.68 at 101.8 mph,,1.44 60 ft.2007
(cam 271/278 roller)9"CC.4.11gear 6.41 at 106.32 mph 1.42 60 ft.(2009) SOLD,SOLD
1970 GTO 455 4 speed #matching,, 3.31 posi.Stock manifolds. # 64 heads.A factory mint tuquoise ,69' judge stripe car. 8.64 @ 87.3 mph on slippery street tires.Bad 2.25 60ft.Owned since 86'
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Old 08-26-2019, 08:37 PM
tjs72lemans tjs72lemans is offline
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My thick squares with tongue has just a hole and no threads. I was wondering how a thick piece like that could accept a u nut anyway.

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Old 08-26-2019, 08:52 PM
'ol Pinion head 'ol Pinion head is offline
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there were two different styles of the thick steel (nut) pieces w the tang. Ones that were threaded, & ones that were mated to a long spring steel type clip nut. In my experience taking '70-72 parts & project cars apart, it's the stamped steel nut, #13, that's tough to come up with.

Need to order the '72 A-body assembly manual, my well worn '71 assembly manual has slightly different illustration

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Old 08-26-2019, 08:56 PM
tjs72lemans tjs72lemans is offline
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I had a feeling I was looking at that #13 as the only thing with clamping force in the schematic. It just seems cheap. I would think a washer and nut on top of the square would be better.

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Old 08-26-2019, 09:09 PM
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You could thread the thick washer to accept the core support bolts if the hole isn’t too big, 7/16 - 14, then put the washer and self locking nut on top if you feel like it. # 13 is a 7/16 - 14 radiator to support frame nut (push on).


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Old 08-26-2019, 09:24 PM
tjs72lemans tjs72lemans is offline
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I bead blasted it at work today. I'll have to see how big the hole is. Maybe I'll get lucky and can tap it.

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Old 08-27-2019, 07:54 PM
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# 13
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72 lemans,455 e-head, UD 255/263 solid flat,3.73 gears,,,10" 4400 converter,, 6.68 at 101.8 mph,,1.44 60 ft.2007
(cam 271/278 roller)9"CC.4.11gear 6.41 at 106.32 mph 1.42 60 ft.(2009) SOLD,SOLD
1970 GTO 455 4 speed #matching,, 3.31 posi.Stock manifolds. # 64 heads.A factory mint tuquoise ,69' judge stripe car. 8.64 @ 87.3 mph on slippery street tires.Bad 2.25 60ft.Owned since 86'
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Old 08-27-2019, 08:13 PM
tjs72lemans tjs72lemans is offline
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My square plates have the tapped hole.

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