Am I screwed? Loud knocking

[Moparfever65]

A hose in your ear is better at finding exhaust leaks than the stethoscope. Stethoscope better for internal stuff.

 

[icetech]

Soo.. any update?

 

[Vinny]

Let’s not the forget the possibility of a loose spark plug.

 

[SIX TO GO]

We gotta know!
Exhaust flange gasket blown?
Don’t leave us hanging…

 

[khryslerkid]

@Daniel Toro ...

 

[eldubb440]

unplug one wire at a time...... if it's an exhaust leak, you will find it

 

[Mopewbie]

Thank you all for your wisdom!

It was the exhaust gasket leak indeed.
Gasket replaced and everything is quiet as it can be again. Car is ready for a wedding next month!

 

[chtampa]

Thank you all for your wisdom!

It was the exhaust gasket leak indeed.
Gasket replaced and everything is quiet as it can be again. Car is ready for a wedding next month!

View attachment 1409156

In UK your cars get married?

 

[Mopar Hunter]

In UK your cars get married?

If they do, my car would be a polygamist.

 

[Mopar Hunter]

Thank you all for your wisdom!

It was the exhaust gasket leak indeed.
Gasket replaced and everything is quiet as it can be again. Car is ready for a wedding next month!

View attachment 1409156

Glad you got it figured out, that can be annoying and worrisome.

 

[icetech]

Thank you all for your wisdom!

It was the exhaust gasket leak indeed.
Gasket replaced and everything is quiet as it can be again. Car is ready for a wedding next month!

View attachment 1409156

Glad that's all it was, so no big thing If you wanna see some serious panic be at a drag strip when someones converter bolts come lose that REALLY sounds like a knock

 

[66Satellite47]

Many, many years ago I had a couple convertor bolts come loose. But with my open headers, didn't really hear anything. Noticed it by manually turning the motor over. The bolts had "milled" a bit off the oil passage bosses on the block. I began using green Loctite on the TC bolts after that.

 

[chtampa]

If they do, my car would be a polygamist.

Large exhaust pipe, you say?

 

[clinks68]

Loud noise coming from the engine. Though about lifters at first but it's quite loud under the engine also.
Tried a flush and oil change but nothing.
I'm very concerned now.
It's a 440 6 pack.

If driving the noise seems to ease a bit but it the rpm goes up it gets much worse.

I tried to make a video:


Thank you.

My buddy just had a similar noise coming from his 440, it ended up being carbon build up on top of the pistons. Removed the heads and cleaned and the noise is gone

 

[biomedtechguy]

When I changed over from HP exhaust manifolds to TTi headers, I knew I'd never go back, and sold the manifolds.
They used to blow out those Fel-Pro gaskets about every 6-9 months.
I haven't had one leak in 5+ years with the TTi headers, same cylinder heads as always.
The 421 in our GTO needed a rebuild, and I suspected it may from the day we test drove the car. I actually got a few thousand knocked off the price we had agreed on (Volo Museum).
In that case, it made a "rotational" metallic knock from around 2,400 to 4k RPMs, but what really made me pull the engine was the low oil pressure when hot at idle. It was so low I installed a mechanical oil pressure gauge and it agreed, less than 10# oil pressure when hot at idle.
It was a rod bearing, and 1 of the 2 halves was cracked in half! It is a true miracle that engine didn't throw a rod.
I'm glad your problem was the expected exhaust leak.

 

[gary h]

When I changed over from HP exhaust manifolds to TTi headers, I knew I'd never go back, and sold the manifolds.
They used to blow out those Fel-Pro gaskets about every 6-9 months.

Is there a Better alternative other than Fel-Pro ?

 

[RemCharger]

Is there a Better alternative other than Fel-Pro ?

Yes bare manifold to head like factory. Can't blow out a gasket that doesn't exist.

 

[Fran Blacker]

Remflex screen reinforced gasket. Remcharger's is a long term fix.

 

[biomedtechguy]

Is there a Better alternative other than Fel-Pro ?

Yes bare manifold to head like factory. Can't blow out a gasket that doesn't exist.

Someone had suggested high temp (copper?) RTV but I never tried that.
I don't know if the surface plane of my exhaust manifolds was straight or not, but I don't have that problem anymore.

 

[OKDart]

Yes bare manifold to head like factory. Can't blow out a gasket that doesn't exist.

Have you tried that with 50+ year old parts? I wouldn't hesitate doing that if both surfaces were freshly machined, but have never tried it with old stuff. I figure there's a reason they're included in gasket sets.

I personally have had good luck with the layered foil gaskets.