Not necessarily. If the shim fits properly, going all the way under the bearing shells, the lip seal will work OK. Do the clearance check with Plastigauge, and see if the shims are necessary. You might be able to remove them and not tighten up the oil clearance excessively. Remove one set of shims at a time, check the clearance as you go, and see what the oil clearance is without them installed. Don't go below .001" clearance. Green Plastigauge will be the right color for .001"-.003" checking. The red or blue will be too thick.
Jerry

Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!