Anyone know of a good 'ball park' value of correct torque for the two 11/16ths nuts for the valve cover of an SPL 311, R-16? (new gasket, carefully cut from 1/8th" thick NAPA rubberized cork, leaks with 5 ft-lbs, but I don't want to crack cover!) Thanks, Dave '68 1600 Kailua-Kona