Sean C. Morgan
When Clarence Mansfield bought a 1978 Ford pickup in the 1990s, it had a typical 400-cubic-inch gasoline-powered engine and a problem.
“It just didn’t run very well, but I liked the way it handled and did the work,” he said.
He used it for a while, then it sat for four or five years because Mansfield didn’t like the way it was running. He built a new engine for the truck, but…