Meticulous Mouse For The Mule
Urban adds these additional oil feed holes (drilled .125 inch) on each side of the main bearing to the road race motors he builds to insure there is sufficient oil to the rod bearings. The location of the hole on these bearings needed to be lower than what he would normally put on his cast-iron bearings as the oil slot in the block didn't go as far along the side of the bearing.
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