Cam bearing R&R

inertia said

I have long drills I run down from the head surface, and main bearing saddle, to open up the holes.
Dress the bearing surface as nec.

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I wouldn't recommend drilling the bearing in the block... How are you going to knock down the sharp burr/edge that it pushes through... It is difficult to be able to get into the cam bearing and re chamfer the oil feed hole after you drill it...