mech Roller vs Mech flat tappet cam Q

tooslow said

There are quit a few articles that say roller lifters are not safe for a stock RB block on the street. Easy to lose oil pressure to the main bearings

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Umm,
you can put a orfice in the oil channels that runs up each side of the block in the lifter galley from the cam journal through the head. Many folks have done this. this stop the crank from getting robbed of oil pressure on that main.