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5.3 ticking sound.. Thanks for the feedback. It's weird, but now the noise has stopped ... even on startup. I feel bad for the shop that was convinced it was an O-ring in the oil pickup that was shot, and it still could be that. But I didn't want to just drop $600 for the hell of it. Really...

Hi Folks, Have a 2001 Tahoe Z71, with only 87K on it. On a trip up to Mt. Rainier the motor started making a "ticking" sound, and seemed to be there even after warm-up. It would go away, as well, here & there. But it easily made the 7 hour round-trip to the mountain & back. Now the noise is...