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In 1935, Pontiac re-introduced their six-cylinder engine, as a 208 cu in (3.4 L) straight-6. The 208 was produced in 1935 and 1936. It was a side-valve design with a timing chain, as was popular at the time. This engine featured a conventional one piece cylinder head, and the distributor was moved to the side of the block.
The 1966 model year saw the introduction of a completely new overhead camshaft (OHC) 6-cylinder engine in the Tempest. The 1962 Jeep Tornado engine was the first post-World War II U.S.-designed mass-produced OHC engine while the Pontiac OHC I6 was available in popular-priced domestic cars. [26]
Pontiac's final straight-six engine was the 1966–1969 Pontiac OHC 6 overhead camshaft engine, which was replaced by Chevrolet's straight-six engine and Buick's V6 engine. a The overhead valve Buick Straight-6 petrol engine was introduced in the 1914 Buick Six luxury car and was produced until 1930. Buick did not make another six-cylinder ...
The Pontiac-built OHC six-cylinder engine was replaced by a Chevy-built 250 in 3 inline six while the 350 V8 was down to a two-barrel 255 hp (190 kW; 259 PS) version. New engine offerings included 400 in³ V8s rated at 265 hp (198 kW; 269 PS) with two-barrel carburetor and 8.6:1 compression ratio or 330 with four-barrel and 10.25:1 compression.
Pontiac engineers modified the design over its life to enhance its performance and reposition the two-seater closer to the implications of its sporty configuration. The Fiero 2M4 (two-seat, mid-engine, four-cylinder) was on Car and Driver magazine's Ten Best list for 1984, and was the Official Pace Car of the Indianapolis 500 for 1984.
With a twin-turbocharged version of the Ford 2.5-liter Duratec V-6 producing 310 horsepower in the early cars (and a very tunable setup), the M12 has mid-engine balance and ferocious performance.