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We used GM Performance Parts head gaskets (4.080 bore MLS PN 12610046) before we put the new heads in place. The threads of the ARP head bolts (PN 134-3610) were coated with 30-weight oil and torqued to 80 lb-ft. The proper torque sequence was followed and performed in three steps: 40, 60 then 80 lb-ft. The heads look great at this point. It's too bad the beautiful Mast Motorsports script will be hidden by brackets, bolts, hoses and wires.