The AMC V8 engines, such as the 290 cu in (4.8 L) engine in one car was bored out to 304 cu in (5.0 L) and the 390 cu in (6.4 L) in the other to 397 cu in (6.5 L). The shop installed exhaust headers, eight-quart oil pans, oil coolers, hi-rise intake manifolds, racing camshafts with solid lifters and stronger springs, and larger carburetors. The cars had engine and rear-end oil coolers, and 37 US gal (140 L; 31 imp gal) cell-type safety fuel tanks.