So doing maintenance on my 1977 350 Bullet I decoked the cylinder head, lapped in the valves, compression release and replaced all the top end gaskets and sealing washers. After a competition yesterday and to my dismay the oil pipe fittings to the cylinder head still leak. I used new (the same aluminum washers as original) and they leak as before. Could I use red fiber washers instead of the aluminum ones? What a mess.