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^^^Leaking rocker shafts should be fixed/sealed during a routine valve adjustment. The flat, rubber seals are one method; another is to remove a rocker/shaft(s), clean them with lacquer thinner, MEK, or similar, and then reinstall them using a very thin application of Loctite 574. The sealant should be applied to the rocker shaft bore opposite from shaft entry, and a thin coat applied to the end of the shaft just before it enters the bore on the trailing end of the shaft. Hard to explain, but do this so no sealant ends up touching the part of the shaft between the two grooves when install is complete (you don't want sealant between a shaft and its rocker arm bushing!).
Shafts usually leak because of small scratches in the housing bores. Those scratches are usually caused during disassembly, when dirty shafts are removed for repairs. My shop always cleaned the ends of the rocker shafts, and the exposed surfaces of their bores, before removal; which avoided the scratching issue. Post job follow up inspection after about 1,000 miles made it clear if a shaft was going to leak, or stay dry, during its lifetime. BTW; at the 1,000 mile service we always checked each rocker shaft for movement, in addition to using the mini-mag and a dentist mirror to check for leakage.
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Keep the Shiny Side UP!
Pete Z.
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