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01-25-2013, 12:03
2013 Silverado/Sierra HD Trucks (http://www.thedieselpage.com/duramax/2013MY.htm) - The 2013s are here! Go here for all of the new truck details.

A Look At 6.5L Piston Protrusion, Head Gaskets and More
At the time of rebuild, a percentage of 6.2/6.5 block decks must be resurfaced because of wear caused by the head gasket's fire ring. The removal of a few thousandths is usually enough to clean up the deck surfaces, which also produces a clean and flat surface for the new Fel-Pro gaskets to seal against. If the machine shop is doing its job, the machined surface doesn't need any further hand preparation. Otherwise, a flat sanding block and 80-grit paper can be used to carefully prep the deck surfaces when not re-machining the decks. Milling the block deck changes the piston protrusion, requiring the use of thicker head gaskets. We show you how to measure piston protrusion and how to choose the correct head gaskets. Now available to subscribers in the Member's Area (http://www.thedieselpage.com/password.htm#features).