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The model year of 1971 started out with much promise of success as a completely redesigned new vehicle proudly carried the Mustang's familiar emblems. With it's wheel base stretched by one inch, it was the largest Mustang ever. The exaggerated styling of the sportsroof's roof line ran almost horizontal as the radically slanted windshield sloped down to below the level of the hood. Windshield wipers were tucked away under the rear of a five and a half foot long hood, and recessed door handles added to the streamlined effect.

Long, low and wide, these cars had an enormous top area, while the top barely reached above the average persons waist. They were solid and luxurious cars that were dressed to impress.

One of the main reasons for the oversized 'stang was Ford's desire to install a radical new version of the big block ''385'' engine series potent 429 engine. This power plant was available in two basic forms as an option. The ''Cobra Jet'' which offered blazing performance with thinwall casting for weight savings, and massive intake with a Rochester Quadrajet carburetor and huge exhaust valves and ports, borrowed from the police interceptor engine. When the''Drag Pack'' was ordered, it became a ''Super Cobra Jet''. The 429 SCJ used a huge Holley carb. to allow its solid lifter camshaft (the same cam as the Boss 429 ) and 3.91:1 or 4.11:1 gears do their jobs. Unfortunatly, these cars were only built during 1970 as goverment safety sanctions pulled the plug January 1, 1971 which resulted in extremely limited big block production figures.

'71 B0SS 351 Mustang was a pumped up version of the 335 series small block engine family more commonly referred to by it's foundry's location in Cleveland, Ohio. Equipped with a solid lifter camshaft it produced neck snapping performance, and was offered as a special performance vehicle option for the sportsroof.

Other 335 engines of note includes the, 351 Ram Air 4v, and the Cobra Jet 351.

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