Cylinder Head Tappet Bores- Stag

Should the occasion arise requiring the placement of a tappet or alternatively a cylinder head assembly, it is important to note the following in order to ensure the correct tappet is obtain.

There are two tappets available - one standard size, Part No. 146594 and one oversized tappet, Part No. 155134. Should a cylinder head have oversized tappet bores, theys will be identified by the letters 'OS' stamped on the upper face of the head adjacent to the tappet.