> Could it be that the engine needs more time and
> miles to get the pistons/ rings to seat? Or is it valves?
One time-honored test is to squirt a small amount of oil into each cylinder
just before checking compression on that cylinder. If the reading goes up a
lot, the problem was rings. If it only rises a little, the problem is
something else. Another is to pressurize each cylinder with compressed air
and see where the air goes.
How long rings take to seat depends a lot on how good the surfaces were to
begin with ... certainly wouldn't hurt to put another 1000 miles on it and
see what happens.
Given all the fuss over ZDDP in oil, it also wouldn't hurt to check valve
lift. Of course your mechanic should have already checked lash, before
doing the compression check. Did he know the right lash for whatever cam
you used?
Randall
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