My Dad made a habit of ordering this option on his 60's & early 70's Pontiacs. He believed it was of use considering the dirt & gravel roads he occasionally drove on. Strange though I can't remember him buying new AC HD airfilters. Will have to ask him...
My experience dragging in parts, only the filter itself was HD... believe it had a black foam band around the outside, similiar to GM airfilters on the '78- mid 80's Olds 350 diesel engines.
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Buzzards gotta eat... same as worms.
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