The 1965 GTO Classic Car was restyled for the 1965 model year and be add 3.1 inches to the overall length while retaining the same wheelbase and interior dimensions. It sported Pontiac’s characteristic vertically stacked quad headlights. Overall 1965 GTO weight increased about 100 pounds and with brake lining area increased nearly 15%.
1965 GTO rated power increased to 335 hp at 5,000 rpm for the base 4—barrel engine; the Tri-Power was rated 360 hp at 5,200 rpm. The Tri-Power engine had slightly less torque than the base engine, 424 lb·ft at 3,600 rpm versus 431 lb·ft at 3,200 rpm. Transmission and axle ratio choices remained the same.
The restyled 1965 GTO Classic Car had a new simulated hood scoop. A rare, dealer-installed option was a metal underhood pan and gaskets that allowed the scoop to be opened, transforming a cosmetic device into a functional cold air intake. The scoop was low enough that its effectiveness was questionable (it was unlikely to pick up anything but boundary layer air), but it at least admitted cooler, denser air, and allowed more of the engine’s formidable roar to escape.