I have owned the Cummins, Detroit and Cat of those era's and my personal first choice is the 6V92 Turbo. They put out the most horse power and have plenty of parts still available since they were used in thousands of buses like Greyhound. There are still mechanics out there who know that engine over the other. Some of the classic Newell owners I have ran into that own the older Cummins and Cats, personally know the engines and do most of their own maintenance. In the late 80's I assume the normal engine option was the 8V92 unless someone just had to have something different.
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