Best way to find an exhaust manifold leak?
 

So I rebuild the carb and the old ‘67 runs like new...then the nasty click noise starts...it’s kinda loud when I first crank the truck, then it goes away when the engine warms up except it comes back when I accelerate, so I assume it’s a manifold leak, and I’m dreading what the fix may entail since the manifold has never been removed...so what’s the best way (or various good ways) to locate it?

Re: Best way to find an exhaust manifold leak?
 

Take 2' piece of old garden hose and hold one end to your ear and use it like a "stethoscope" moving all around the manifold with the engine at idle. You'll know when you hear the leak.

Gary

Re: Best way to find an exhaust manifold leak?
 

Have someone put their hand over the end of the exhaust pipe(s) while you look for the leak under the hood.

Re: Best way to find an exhaust manifold leak?
 

I haven't actually tried this... but I wonder if you could just put a vacuum hose into a container of ATF and watch for smoke. I wouldn't recommend too much ATF at once, but a little won't hurt the engine.

Re: Best way to find an exhaust manifold leak?
 

your bare hand on cold engine running