Re: gas cap questions galore..
iirc the different size filler necks used the same size caps...the rubber grommet where they go thru the cab is different....the vented cap (for the non vented tank) has a raised area inside the cap with a small hole in the center...that's the check valve....as far as what specifically fits what truck I cant help you...and they could have been swapped by now
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1970 short step c10 leaf spring 454
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