Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
CB750 head gaskets are a minefield, at least 3 different types fitted between 1969 and 1979 For a 750K1 you need a Vesrah VG156 or you can use a VG157 and upgrade it with O'rings but not the ones in Ash's link ( they are only for Honda orginal head gaskets ) . With any after market gasket set, you can't use the O'rings supplied with the gasket set on the head or base gasket as they will not seal.One of the hardest things is to get all the oil ways to seal up on any early CB750. If you need any upgraded O'rings to do this job, i hold stock of them
Cheers for clarification Graham.Is the Vesram gasked decent quality? Is that what you fit?A good aftermarket gasket set and i have fitted more than a hundred in the past few year and never had a problem as, long as you up grade the o'rings