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Might I add that the our traditional rocker arm-cam lobe contact area produces high pressure and thus requires the zinc and phoshorous that's found in only a few brands of today's lube oil.
So, if an effective roller rocker assembly can be produced, this will reduce friction at this point, free up a fraction of engine power and reduce the need for special oil additives in the lube.
But this is not a small undertaking.
Sherwood
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