Ford 427 Cammer:

Effectively banned by NASCAR

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Corvair OHC:

Died with the birth of the Camaro

Olds OW-43:

Died when power took a back seat to everything else

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DOHC Hemi:

Died with Ford’s cammer

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Jeep Tornado:

Survived in Renaults until β€˜82, died in domestic markets in β€˜64

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Pontiac’s Sprint 6: