GM kickstarted a move towards friendlier fuels in 1971, but performance took a back seat
had used a short-stroke 302 cu-in. V8 designed to comply with Trans Am racing rules, but for 1970 Chevy’s street Z/28 borrowed the hot LT1 350 from the Corvette. Fitted with solid lifters, big valves, a lumpy cam and aluminum pistons that gave a 11.0:1 compression ratio it made 360 hp . But the compression fell to 9.0:1 for 1971, taking power down to 330 hp.The 1970 Chevelle SS 454 with the optional LS6 engine and sky-high 11.
But that was a smokescreen: the fact that it developed that power 600 rpm earlier and made 35 lb-ft less torque revealed the new character. And if that didn’t, the availability of a 245-hp small block with a pathetic single exhaust rammed the message home.Compared with GM, Chrysler hung on to more of its horsepower when 1970 rolled over into 1971. True, the 383 cu-in.
, and not just because the new styling didn’t tickle everyone’s fancy, particularly when it came to the coupe. The base 250 cu-in. six parted with 10 hp it could hardly afford to lose, dragging peak power to 145 hp, and the mid-spec 351 cu-in. V8’s output also fell 10 hp to 240 hp.
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