Quote:
Originally Posted by GMC AMI
72 caps are not the same dia. as the other years. Due to the introduction of no lead fuel the fill tube dia. is smaller than earlier years.
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I recall 1975 as the introduction of catalytic converters, and unleaded fuel, for cars and light (under 8600#?) trucks.....???
My '72 has large-diameter fill tube, not the restricted one for unleaded.