The problem is that I CANNOT attain the proper clearance of the rocker arm to
the valve by turning the adjusting screw. The rocker arms are beyond the
limit because the rocker supports are sitting to low. The only thing I can
think of is that maybe the bottom of the head has had material ground from it
several times over the years and now the rockers are beyond the limit of
proper clearance from the valves.
>It isn't the valve rocker supports that adjust the height on the >valves,
>but the small screw at the head of each rocker that rests into >each push
>rod. Also around this screw is a lock nut. Generally, you >loosen the
>screw and stick a feeler guage (a very thin piece of metal, I >don't have
>the correct thickness' handy - there is one size for exhaust >and one for
>inlet) in between the head of the rocker and the spring. When >the gap
>between the rocker and the spring equals the metal gap guage, >you tighen
>the lock nut to keep in at the same size. You rotate the engine >and
>repeat the same for each valve.
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