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I could be wrong but the 350 and 400 have a different number of the copper washers fitted, 12 copper for the 350, 10 copper and 2 Dowty type on the 400. It may depend on which fiché / parts book you are looking at possibly.
I resurrecting this thread as I am about to put the head on, finally after all the issues I had with the gasket.Now, as mentioned several times here, the fiche says 10 x copper sealing washers; thing is, I only took 8 out - or at least I only have 8 now, plus the two dowty-type ones.Am I correct in thinking that I can replace the missing pair with washers of a different thickness? What would be the impact of leaving them out altogether; say on the two nuts by the spark plugs?