size increased as well, to intake and exhaust valves on high-performance heads. Low-performance and two-barrel applications, the standard engine in full-sized Pontiacs, got intake and exhaust valves and pressed in rocker arm studs. The four-barrel 400 was a popular performance option for many of Pontiac's cars. When fitted with other high-airflow components, it produced a good balance of low-end torque and higher-RPM power. In the 1968 Pontiac GTO it was given a 10.75:1 compression ratio and tuned to deliver 360 horsepower and 445 foot-pounds of torque. 350 In 1968 the 326 was replaced by the similarly 389-derived 350, which used a bore and stroke for a total displacement of . Like the 326, it was offered in both 2-barrel and 4-barrel versions. In 1968, a HO option was offered in the Tempest and Firebird. The 1969 HO 350 HO was equipped with the 's large valve heads (# 48's) and the 400 HO camshaft and rated at . In 1974 it was used in the GTO and was rated at (net). Applications: 1968-1977 Pontiac Firebird 1968-1977 Pontiac LeMans 1968-1981 Pontiac Parisienne 1968-1970 Pontiac Tempest 1969 Pontiac Custom S 1971-1977 Pontiac Catalina 1972-1975 Pontiac Ventura 1973-1977 Pontiac Grand Prix 1974 Pontiac GTO 1978 Pontiac Grand Safari 303 In 1969, Pontiac unveiled its Trans Am model Firebird, and since racing rules required engines of less than , Pontiac unveiled the 303 for racing models only, never available to the public. Bore and stroke were . It was rated at . 301 The 301 was offered from 1977 to 1981 and also installed in other GM cars during those years. The 301 had a bore and stroke of . Based in part on designs for the "short deck" engine designed for the 1970 racing season, it had a shorter deck than the big V8, and used thin-wall castings to reduce weight. The crankshafts were also unique in the fact that they featured only two counter weights instead of the usual five and also featured lightened connecting rod journals. This resulted in a lightweight design weighing less than the Chevrolet small-block V-8. Power output ranged from to . The heads were a new design featuring siamesed intake ports. The short-deck block and different intake ports also required the design of a new intake manifold. The Pontiac 301 EC (Electronic Controls) version offered in 1981 produced and , although it's rumoured that the actual output