Ok so about 2 years ago i rebuild the top end of my CB360. honed the cylinders. gave it new rings and new gaskets. the only gasket i could not find for it the is the one for the cylinder head. when i took it apart it had silicone on it so thats what i did but later on a shop owner said that i should have used a gasket and that one existed. i have searched high and low for this one gasket and can't find it anywhere. does anybody have any insite to this? does it really exist or did it only come for the factory built motor?