DougM---It's my opinion that a heavier spring does nothing to raise
pressure when the oil is hot. A stouter spring will delay the bi-pass
from opening when the oil is cold and the pressure is already high, but
who needs this pressure then?
I would imagine some harm could come from pressure going too high (over
100psi)? We know the oil pump driver will try to turn the pump, & the
pump will try to do its job. Don't know what would be the first part to
fail. If you decide to go with the heavy spring (or shim the one you
have) keep an eye on the pressure gauge while accelerating a cold
engine.
Dick
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