Pontiac produced the Chieftain beginning in 1949, and ending with the third generation in 1958-the only year for the G3. Longer and lower are the buzz words in 1958 and the new air suspension smooths out the ride. The occupants could listen to a new and much more reliable transistorized AM radio, if it was checked on the order sheet. Under the hood the engine is the largest yet- this V8 is now 370 cubic inch (6.1 L) generating 240 hp (180 kW) or if the tri-power option is chosen the same engine puts out 270 hp (200 kW). You could either pick the tried and true “three on the tree” standard transmission or opt for the Super Hydra-matic.