 The 1967 model year saw the introduction for the Pontiac Firebird pony car, a variant of the Chevrolet Camaro that was the brand's answer to the hot-selling Ford Mustang.Intermediate sized cars (Tempest, LeMans, GTO) were mildly face-lifted but all full size cars and GTO lost their Tri-Power engine option though it did get a larger 400 cubic-inch V8 that replaced the previous 389.Full-sized cars got a major facelift with rounder wasp-waisted body lines, a name change for the mid-line series from Star Chief to Executive and a one-year-only Grand Prix convertible.