24-hour courses. Ford kept the Mach 1 in production into 1970 and little changed other than the visuals. The 1970 body included dual-beam headlights with the previous inner headlights becoming sport lamps and recessed taillights on a black honeycomb rear panel, side scoops behind both doors removed, revised bucket seats, deep dish sports wheel covers, as well as new side and rear badging and striping were the main visual differences. The 1970 model year Ford did use the Windsor 2v motor on some earlier built cars until the new 351 cu in (5.8 L) Cleveland (351C) V8 in either 2V (for use with 2-venturi carbs) or 4V (for use with 4-venturi carbs) versions were used exclusively. The 351C 4V (M code) engine featured 11.0:1 compression and produced at 5400 rpm. This new engine incorporated elements learned from the Ford 385 series engine and the Boss 302, particularly the poly-angle combustion chambers with canted valves and the thin-wall casting technology. Engines First generation Mustang Facelift (1971–1973) For 1971, Ford reduced the content of the Mach 1. The standard features of the model were as follows: SportsRoof body style with unique "05" VIN code & "63R" body code on the door tag Color-keyed urethane front "spoiler" bumper & front fender and hood trim Honeycomb grille in black w/sportlamps Argent or black "Mach 1 – MUSTANG" decals on fenders Argent or black stripe and "Mach 1" decal on the trunk lid Argent or black lower body accent paint Bright trim at lower body paint line E70-14 white sidewall tires w/ hub caps & trim rings on 7" wide steel wheels Color-keyed dual racing mirror w/driver side remote Honeycomb taillight panel applique with bright trim Unique pop-open gas cap F-code 302-2V engine w/3 speed manual transmission Competition Suspension (HD springs & shocks), variable quick-ratio steering box if ordered with P/S Base Mustang vinyl interior Flat hood – the NACA scooped hood was a no-cost OPTION for the base engine In 1971, the Mach 1 was available with three 351 Cleveland engines; the H-code 2-V, the M-code 4-V, and beginning in May 1971, the Q-code 351CJ (Cobra Jet or GT engine). M & Q code engines were produced concurrently up until the end of 71 model year production. There were also two 429ci options, the C-code CJ (Cobra Jet) & J-code CJ-R (Cobra Jet – Ram Air). Buying the optional "Drag Pak" 3.91 (V) or