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Basically I couldn't tell where mine was coming from... it sound like it was in the top of the motor and I removed my valve covers... everything was good.
Chevy dealership pulled the heads and bingo. Lifter was stuck and wore down the first lobe on my cam... so they replaced the lifters and new cam.
Theres a TSB on this.... take it to the dealer.
Sent from my Apple sued Galaxy Note 2
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