From my stove bolt history notes:
1929 was the year General Motors introduced their new inline 194 cubic-inch (50 hp) ‘Over Head Valve’ six-cylinder in the Chevrolet and GMC trucks. The new six cost only ten dollars more than the 1928 four cylinder. GM marketed their new engines as giving Chevy owners “a six for the price of a four”. The new engine used an ‘Over Head Valve’ (OHV) layout, conceived by inventor and founder of Buick Motors, David Dunbar Buick, but patented in 1928 by Arthur Chevrolet. The 216 cubic-inch six-cylinder engine was introduced in 1937.
