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Here’s a Top 10 Assembly Tip—Drill a 0.040-inch hole in the front oil galley plug that threads into the front of the engine block to duplicate the factory plugs. The small hole allows air to escape from the lifter galley, and it allows engine oil to lubricate the timing chain and gears.
396ci Chevy Big Block - Engine-Building Tips

 Here’s a Top 10 Assembly Tip—Drill a 0.040-inch hole in the front oil galley plug that threads into the front of the engine block to duplicate the factory plugs. The small hole allows air to escape from the lifter galley, and it allows engine oil to lubricate the timing chain and gears.  View Related Article

 

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