Under the Hood of a Country Music Legend The 1978 Trans Am wasn't just about looks ... Haggard's most likely had the standard 400 cubic-inch L78 engine. This powerhouse produced 180 horsepower ...
like the one-of-a-kind Trans Am 400-H.O. The 400-H.O. is a tribute to Pontiac's original 400 High Output option, with a ...