Roller cam bearings

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Originally Posted by SSDiv6

NASCAR engine blocks, have closed camshaft tunnels; therefore, the roller cam bearings, camshaft and lifters were always flooded with oil. The initial idea for the use of roller bearings was to reduce friction. Nevertheless, no one expected valvetrain frequencies and harmonics to generate from its use.

Junior Johnson was running roller bearings in a stock Chevrolet block in 74. I saw a stock open tunnel block at Smokey Yunicks shop from the 70s or 80s also with roller cam bearings. Maybe Jenkins saw harmonics, but the Nascar guys were cheatin with them before with success.