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The sweep on the windshield wipers on my '72 Vette extend well beyond the edges of the windshield. Is there a manual that tells me how to adjust the sweep of the wipers?
Needless to say, your 'Vette is 35 years old and the wiper linkage assembly is very worn. There should be some adjustment - check it out.
If not, do as I did on my '81 when the wiper assembly was so worn (adjusting didn't work) and the wipers hit each other - I bought new wipers one inch smaller - no problem!!
We have addressed this on our “repair help” section. It is free for all to us and it will help you get the adjustment correct. I’ve pasted the link and the picture below.