13B One Piece Engine Dowel Pins**Back in stock and shipping orders as of 5 30 26** One Piece Dowel Pins (drilled upper solid lower) Helps prevent cracking the plates from hp loads or ping (esp. important in the Series 5 & earlier turbo engines) Spreads the load across the length of the engine. Helps to insure a true engine centerline which reduces engine failure and increasing bearing life Using an external oil line provides a more even oil pressure to the main bearings (if running