GM Repair Problems? Ask GM Repair Expert Now.
Hi, I'm Chad ,Welcome To JustAnswer, I'm reviewing your question and I will be be posting a replay ASAP
if the noise is coming from top of engine then most likely that is lifter noise
if the noise coming from bottom of engine , could be rod & crank bearings ?
if the noise get less noticeable the longer it runs , then lifter will be suspect .
if no change and the noise is constant , then bottom end issue.
Please let me know , if you need anything else on it
ASE Certified Technician