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I'm a new member. I have the feeling that someone here might know how to uncover/find the harmonic balancer runout spec. for a Gen 3 LS - my motor is a LM7. 2006 Chevy Tahoe 5.3 - gas.
The best I can dig up is a reference to GM document #PIP4750E. This document list 0.4mm as an allowable runout but doesn't explicitly call out a 5.3 motor.
I just had the original replaced and I'm not really liking the runout because it is causing the AC pulley to bounce.
I measured the runout on the grooves and it is 0.025" or 0.63mm. See picture.
This was a Delco part so not sure buying a better one is possible. The mechanic said he would not be able to guarantee a runout but would replace it. Could be that one would have to purchase a performance damper that is not made with
rubber separating the parts. Some of the performance dampers have an "internal" damping element. Any ideas?
Thanks,
-Henry
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Harmonic Balancer Spec. - Gen 3 LM7 
