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Author of "101 Projects"
Join Date: Jan 1995
Location: Rolling Hills Estates, CA
Posts: 27,056
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They were used only on the RSR motors, because the RSR rocker shafts were slightly a smaller diameter. This was done for reasons I can't quite remember. I think it had something to do with the camshaft-fed oiling system, but don't quote me on that. Because the rocker shafts were slightly smaller, they leaked if you didn't use the seal...
-Wayne
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