For 1967 the 4-4-2's styling and base engine remained the same, save for: minor trim changes and a 1967 4-4-2 only distinctive louvered hood as well as an increase in intake valve size to 2.067 from 1.99. but the automatic three-speed Turbo-Hydramatic with Switch Pitch became available, replacing the two-speed Switch Pitch Jetaway, as was the case with the mid-sized muscle cars from other GM divisions (Pontiac GTO, Chevrolet Chevelle SS396, and Buick GS400). The heavy-duty floor-mounted three-speed manual transmission was now standard with the Muncie M-20 and M-21 four-speeds optional, all with Hurst shifters. Front disc brakes were a new option this year.