• Heads- I do of course mean the tappet chests within the heads, sorry.

    The standard cast tappet chests are, on a number of levels, not great for not only our purposes, but indeed anyone's purposes. In standard use they can be subject to hydraulic fracture, and given that we are reducing the base circle diameter we are also going to be making the tappets themselves rise further in their bore, which also means that the existing oiling holes are in the wrong place. So we decided to make new ones. The billet tappet chests will fit into the existing heads.

    So! Not quite as mental as I made it sound, apologies.

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