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Old 05-27-2022, 12:42 AM   #4
mr48chev
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Join Date: Jul 2007
Location: Toppenish, WA
Posts: 15,838
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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