it depends on the lifter type, those holes are for oiling the rockers you don't want to go to solid push rods if it's designed for rods with oil holes, well unless you need an excuse to rebuild your motor.
You need that hole there to lubricate the rockers. Oil is pumped through the main galleys to the lifter bores. From there it goes up the pushrod to lubricate the rockers, valves, etc.
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