The 1966 Pontiac GTO had a smoother, rounder appearance with wide wheel openings and a recessed split grille. There was now a separate GTO series. GTO features included a distinctive mesh grille, bucket seats, single hood scoop, walnut-grain dash inserts, specific ornamentation, 115 inch wheelbase and dual exhausts.
The 66 GTO was equipped with a 389 cubic inch 335 horsepower V-8 engine. It had a Carter four barrel carb and a 10:75 compression ratio. It could do 92 MPH at 15.4 seconds in the 1/4 mile and 0-60 in 6.8 seconds.