318 Main Bearing replacement difference.

toolmanmike said

The grooves are for oiling the upper engine as the crank spins. The more area around the bearing, the more oil get's to the cam and heads.

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Not exactly. That groove in the bearing sends oil to the rods full time. A half groove bearing sends oil to the rods only half the time.

It has nothing to do with how much oil gets to the heads.

Run the bearings. You’ll be fine.