News:
I use the thicker cardboard type on my Hemi. Whatever type you use, make certain that you are using the right thickness gasket. If you are running stock height valve covers and stock height spark plug tubes, then you don't need the big fat/thick gaskets. If you try to run too thick a gasket, the spark plugs will screw right through the bottoms of the spark plug tubes after a few valve adjustment cycles. Everything has to be the right thickness for all the rest of the gear being used.......