I don`t like the idea of using cork..typically it`s much thicker then the regular gaskets..and i feel it would likely split under the proper torque..

when in doubt..knock`um out...(or wish ya had later!!)...H.C.C.M.F LOCAL 6978

Flint Michigan..most dangerous city in the USA..come back and visit us..sorry we "missed" you the first time..LOL
"Flint 'Vehicle City' Now America's Murder City"

Officially #1..
http://finance.yahoo.com/family-home/article/112804/most-dangerous-cities-247