Larry---Usually the rocker shaft will wear out before the rockers
themselves, as evidenced by moving the rocker to an unworn place on the
shaft, and finding it snug. I'm going to assume a few things here.
i.e., The rocker shaft was case hardened by whoever supplied or
manufactured it. The oil hole to the last rocker it open to lubrication.
Some owners may suggest that an auxilary oil line be connected, to
supplement the oil flow to the rocker shaft. (Available from Moss, or
other supplier.) Since the original design allowed for sufficient oil to
the rockers, it must be assumed that something else is out of sorts,
possibly low pressure all around, or more likely the cam bore is too
loose at the back journal, where oil is forced up to the rockers. If
this is found to be the case, it can be corrected by line boring the
whole block, and inserting cam bushings as in the Spitfire. Again
supplied by Moss, TRF, etc. Not every machine shop can handle a six
cylinder block, so one should be found before purchasing the bearings.
If the engine has a lot of miles on it, (and it must to be this worn,)
an exchange block might be more advantageous.
Dick Taylor
CF11143
L.A., CA.
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