I've been researching rocker arm related info on the site and have a question about connecting the 3 holes in the block cam journal with a groove to increase oil flow to the rockers. I imagine this is done with a die grinder and narrow grinding wheel? If this is true, then what width and how deep??

I understand that restrictor plugs would then be needed in the oil passages in the heads or rocker stands to prevent flooding of the valve chamber even with unrestricted return tubes.

What is the advantage gained by this modification?



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