oil pump

[Philip Erickson <philip.erickson@Agouron.COM>]

You can use a spring compression gage to "guess" the increase in by-pass
pressure, but be careful about restricting the flow of oil out the
by-pass because the  "valve" can not move enought. ( better to find a
stronger spring, nissan comp. spring?)  Otherwise if you rev your engine
when its cold, you could blow out the oil filters.  Been there, done
that.
Phil
2000 with pump spring shimed ~3/16 "