My 422 smallblock build

yellow rose said

I've drilled holes in bushings and tubes and never had a jig.

Like I said above, unless he is using pressure fed lifters there is no reason to put holes in the tube.

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Maybe I'm missing something but if the tube is installed and not drilled, where does the lubrication for the lifter bore and the cam lobe to lifter face come from? I'm not intimately familiar with the oiling scheme in the SBM.