 Pontiac produced cars offering , (3.25x3.75 in, 82.5x95mm) L-head straight-six cylinder engines in the Pontiac Chief of 1927; its stroke was the shortest of any American car in the industry at the time.The Chief sold 39,000 units within six months of its appearance at the 1926 New York Auto Salon, hitting 76,742 at 12 months.The next year, it became the top-selling six in the U.S., ranking seventh in overall sales.