Quote:
Originally Posted by bigblockv6
Considering the last year V6 engines were available in pickup trucks from the factory was 1969. EGR valves came around 1972. Bigger trucks equipped with V6 engines from 1972-74 didn't need to meet emissions standards requiring EGR valves.
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This also brings up that GMC dealers were setup to install V6 engines in pickup trucks if a customer requested this option from 1970-72. In 1973 that option was dropped, emissions could have been the reason.