The 1966 Pontiac Grand Prix was a personal luxury coupe that featured a sleek design with a rounded split grille and hidden headlights, alongside powerful V8 engine options like the 389 and 421 cubic inch motors. This model year saw a mild facelift with new grilles and taillights, a refreshed interior with bucket seats, and the replacement of the 338-hp 389 Tri-Power engine with the new 421 engines. Production was limited, with only 36,757 units built, making manual transmission models particula