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For additional timing chain lubrication,   some engine-builders drill one oil galley plug (0.030-0.035-inch) at the front of the block.   This allows oil to spray onto the timing chain during engine operation.
Plugged In And Ready

For additional timing chain lubrication, some engine-builders drill one oil galley plug (0.030-0.035-inch) at the front of the block. This allows oil to spray onto the timing chain during engine operation.  View Related Article

 

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