[punkin]

I am a tech and have done many repairs in my 52 yrs. and this is different. It is not lifter rattle or piston slap (for I have a Z28 and it is really quiet for 101,000 miles of not babying it)Id does have the plastic intake and I believe this is part of the problem. Like years ago on my 3 Duce setup on a 65 GTO sound can be emitted from ares other than the tail pipes. The tech today looked for Service Bulitines from GM on this but he couldn't find then (he had told me of this problem 2 weeks ago) he is hopefully looking further to find it. But he did say it did have to do with the emissions, plastic intake but couldn't pin point exactly. There was a change in the air intake system in 98 though.But the sound comes from inside the engine but emitted out of the hose. thanks