Re: GMC V-6 ignition question
There was never a small cap clip on distributor used on GMC V6 engine. The big style cap with the window was used from 1960-65 but around 1965 and even possibly 1964 the small cap, same one used on inline sixes was used on light duty engines while bigger trucks still used the larger window style cap, by 1966 all V6 engine came with the small cap distributor. I don't know why they made the change but the larger cap distributor makes better sense to me because you can adjust the points externally.
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