normal noise or something else?
Another reason could be you have some engine sludge built up either in the pulshrods or anywhere else on the oil ports on those heads, so the oil fully doesn't get there (even with synthetic it still sludges) so what you want to do it run a good oil flush. Not the stuff you can get at autozone, napa or orielleys. I recommend calling around to your local mechanics and asking what kind of product for oil flushes they use. My shop, we use BG products and that **** works great! Use a can or 109 flush and the. Put good oil (can do 10w-30) at the same time to save money, and add a can of MOA, which is additives that help wear and protects from it. Do that and then let us know if the noise is still there. If it is you might have to pulls heads and have some work and replace those valve train parts of the noise REALLY REALLY BOTHERS YOU
Another reason could be you have some engine sludge built up either in the pulshrods or anywhere else on the oil ports on those heads, so the oil fully doesn't get there (even with synthetic it still sludges) so what you want to do it run a good oil flush. Not the stuff you can get at autozone, napa or orielleys. I recommend calling around to your local mechanics and asking what kind of product for oil flushes they use. My shop, we use BG products and that **** works great! Use a can or 109 flush and the. Put good oil (can do 10w-30) at the same time to save money, and add a can of MOA, which is additives that help wear and protects from it. Do that and then let us know if the noise is still there. If it is you might have to pulls heads and have some work and replace those valve train parts of the noise REALLY REALLY BOTHERS YOU
I listened to mine make all kinds of noise for 75k, not no more! Now its nice and quiet. This product should come with every GM car and truck. 
