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Old 12-29-2012, 03:54 AM   #1
badpeanut
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Purpose of Mystery Factory Hole in Radiator Support?

Why is this factory hole with a nut welded to the backside on the radiator support?

It is only on the passenger side.

The attached picture is a 1972 Blazer from the Internet, but my 1972 GMC pickup has it and I'm trying to figure out why GM put it there.
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Old 12-29-2012, 05:33 AM   #2
SS Tim
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Re: Purpose of Mystery Factory Hole in Radiator Support?

It was an alternate radiator retainer location. IIRC it was used on I-6 trucks. This is a '67 V-6 (KM).
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Old 01-04-2013, 02:39 AM   #3
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Re: Purpose of Mystery Factory Hole in Radiator Support?

A 2 inch narrower radiator, 6 cyl. and v8...i think the wide rad was a big block
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Old 01-04-2013, 11:58 AM   #4
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Re: Purpose of Mystery Factory Hole in Radiator Support?

Quote:
Originally Posted by 70blackfish View Post
A 2 inch narrower radiator, 6 cyl. and v8...i think the wide rad was a big block
Small block V8's use the outter set of holes, as well as 6 cylinders with automatic transmissions or A/C. Pretty much all radiators with plastic fan shrouds.
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Old 01-04-2013, 10:25 PM   #5
PanelDeland
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Re: Purpose of Mystery Factory Hole in Radiator Support?

Width of the radiator changes from a 4 core.I don't remember all the criteria,but I went to the other holes when I put the (way overkill) 4 core in my 68 with a 250.
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