engine knock or exhaust gasket?

[Thighs]

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

ive never heard an exhaust leak that sounded like a knock before. usually they make 2 different noises.

but based on the OP, he knows his gasket has a huge hole. that would mean its most likely the gasket. replace the gasket and if it still makes noise, you need a motor.

[green91]

ive never heard an exhaust leak that sounded like a knock before. usually they make 2 different noises.

but based on the OP, he knows his gasket has a huge hole. that would mean its most likely the gasket. replace the gasket and if it still makes noise, you need a motor.

I have heard an extreme leak (basically open dp) that did sound like it had a knock but its the one time that i have heard it.