Quote Originally Posted by green91
its a z6 so its obviously not an accord. seems like a dumb question to me, go ahead and replace the gasket first, a severe leak can sound like a knock at times. if the engine is knocking you're much better off replacing at least the short block since it seems you aren't very literate as far as engine rebuilding
correct, havent built an engine myself yet.....was just wonderin if a header/exhaust leak could sound like a knock....and the noise goes away above 25k rpm so that made me ify on what the prob is...