[bigblockv6]

I would have to say that held true for medium duty and heavy duty trucks not pickups. My father owned a grocery store in San Francisco and in the late 60 to early 70's I could remember the majority of medium duty trucks that made deliveries were GMC V6 trucks and there was one liquor distributor made deliveries in a HM-7500 series. Some of the bigger companies were Gallo wines, Nabisco and Morell all had GMC V6 powered trucks. Of course our delivery truck was a 62 GMC K1000 then the 68 KM2500.