WHen you removed and installed your cam it probably distorted the main bearing journals.I have seen this happen numerous times with lt1 blocks with mileage in excess of 130k in which the cam was swapped out for a more aggressive one. In the lt1s you almost always need to rebuild the bottom end to ensure it doesnt give up the ghost due to bearing distortion but then again the 3800's may be a different story.:th_thumbsup-wink:
I was thinking the same thing, what does the cam have to do with the main bearings?
about as much as the mufflers have to do with the intake.
between all of us with motor issues in the past few months or so.... there will be NO MORE used motors on the market in the near future if **** keeps goin like this.