Re: Weird noise after changing head gasket
That is the best description of an exhaust leak I think I have ever heard.
I don't know if it's the head gasket (Doubtful), the exhaust manifold gasket (Very Possible), or the exhaust head pipe to exhaust manifold connection (Very Possible), but you have an exhaust leak...
If you have the pulse air system, it could be that also.
I just went through that with my father's old beater truck...
"I Have The Body Of A God... Buddha"