The '69 air cleaner snorkels are less than 90 degrees apart and have no vent hole drilled, while '70 and later used 90 degree spaced snorkels and drilled bases for vent hole. Not sure if '70 had this hole, '71 did for sure. The '71 units also had a black lid, not chrome. All had ink stamped dates inside, but very few survived. Occasionally, I'll find one in readable condition.
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