You are bidding on a complete cylinder head for a Cummins / Dodge application. This is for the 12 valve versions only. This is a completely dressed head that comes ready to install onto your engine. Head gaskets are not provided for this item, but can be purchased for an additional charge. This is a stock replacement and does not come with any modifications. There is no core on this item, you do not have to return a core on this purchase. It comes complete with valves and springs.