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Omega

The ZR1 350 option was 1970 only. The following year environmental regulations . . .

 

. . . forced manufacturers to lower compression ratios.  There were still a few high-performance engines offered in '71 and '72 but by '73 they were all gone except for Pontiac's 455 HO.  The very last high-performance engine was the '74 Pontiac 455 HO . . . unfortunately only a few were made.  It wouldn't be 'til twelve years later that performance returned to the American motor scene.

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