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On this small-block Chevy, the upper half of the main bearing is placed into the block. Note that the upper is grooved and has a hole for lubricating.  The lower half of the bearing fits in the main cap and has neither groove nor hole.
Around the Block

On this small-block Chevy, the upper half of the main bearing is placed into the block. Note that the upper is grooved and has a hole for lubricating. The lower half of the bearing fits in the main cap and has neither groove nor hole.  View Related Article