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To seal the cylinder heads onto the short-block, we used Fel-Pro's line of PermaTorque MLS gaskets. We've used the 1161s in the past and have had great success with them, even with big hits of nitrous. When you order them, it's important to note that they are sold individually and numbered 1161L and 1161R, for left and right. With the heads in place, Nathan Hall then torqued them to 70 ft-lb with moly.