Originally Posted by o2camaross Might be valve seals maybe +1 Sounds pretty typical valve seal issue on start up.
ECSB 2kSierra 2wd 4.8L-K&N-HPtuners-Calspeed LT's-Magnaflow-Tahoe20's-HankookRH06 waiting to go in... 3.90s, 214/220cam
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