Since the Boss block is a big-bore motor, we needed a big-bore head gasket so we wouldn't disrupt the airflow in the cylinder. Fel-Pro provided us with a set of MLS (multilayer steel) head gaskets (PN1134). These gaskets feature a 4.180-inch bore size, a 0.041-inch thickness and a 9.3cc compressed volume. As with other Fel-Pro head gaskets, the front end is marked to ensure that you line everything up correctly. The ARP studs are basically the 351-spec pieces, but with the extra-long holes of the Boss block, you'll need to set their height once you have the head on the block, otherwise they'll be too short. We used motor oil to lube the threads that go in the block, and assembly lube at the top.