Re: Upper Radiator support bracket
The Chevy radiator (it appears to be rather than having a GMC filler neck on it) was never going to work right on the GMC anyhow.
The cure is to leave that cap on or a low profile cap and run an inline filler neck in the upper hose. https://www.ebay.com/itm/131638888119
The correct GMC radiator sets further forward with it's mounting brackets Than a Chevy radiator does. Similar to this one https://www.ebay.com/itm/33437238711...gAAOSwRO1iIB0O
You can see how the Champion made for a GMC moves the core forward over 1/2 inch. https://www.ebay.com/itm/29429804268...cAAOSwX7FicQ2S
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Founding member of the too many projects, too little time and money club.
My ongoing truck projects:
48 Chev 3100 that will run a 292 Six.
71 GMC 2500 that is getting a Cad 500 transplant.
77 C 30 dualie, 454, 4 speed with a 10 foot flatbed and hoist. It does the heavy work and hauls the projects around.
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