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Decking the head almost closes off this oil galley that runs between the block and the head and sends lubrication to the cam. Yates opens it back up to allow good, clean flow.
Project Mudslinger: Shoehorn, Please!

Decking the head almost closes off this oil galley that runs between the block and the head and sends lubrication to the cam. Yates opens it back up to allow good, clean flow.  View Related Article