my 04 (yes i know ls1) has a "noisy" valve train. has since i bought at 28k miles. never any better, never any worse. don't hear it on the highway on when idling. in the driveway or drivethru situations. i was told once that the ls motors are know for noisier drive trains. i have alway thought that mine was noisy. i put an oil pressure guage in mine, carries 40+ lbs of pressure at idle and will hit 100+lbs at full throttle. an actual pressure guage may help put your mind at ease if you know the pressure.
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