Most Y-Blocks have over flow pipes at the rear or front of the rocker arm. I understand that this is to direct oil flow from the rocker arm back into the engine. My newly rebuilt 312 does not have these overflow pipes and the holes are plugged with a square head bolt. My question is, are the overflow pipes required and necessary and will the arms get proper lubrication with them plugged? I read the archive posts relating to rocker lubrication and did not see a definitive answer.

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