1969 HP exhaust leak

[69ChargerR/TSE]

I have tried 4 times.
I tried copper RTV.
I made sure both surfaces are smooth and flat with a straight edge.
I torqued to 35lbs and increased to 45lbs.
Dang thing still leaks.
I’m tempted to pull the manifold.

 

[69ChargerR/TSE]

Not sure how to add a video from my phone.

 

[dadsbee]

What are you using for a gasket? OE was a flat steel with a small bead. Rarely works on older stuff but newer fiber works well

 

[Tony Tee]

Maybe the exhaust is leaking from the heat riser shaft. It might be worn out ?

 

[QuickBpBp]

Maybe the exhaust is leaking from the heat riser shaft. It might be worn out ?

I was just going to post this.

 

[69ChargerR/TSE]

What are you using for a gasket? OE was a flat steel with a small bead. Rarely works on older stuff but newer fiber works well

Felpro

 

[69ChargerR/TSE]

Maybe the exhaust is leaking from the heat riser shaft. It might be worn out ?

Was considering that as well.
The only flange gasket was leaking.
I wonder if I can replace the heat riser while installed. Or at least the shaft.
Maybe install some small plugs where the shaft goes.

 

[69ChargerR/TSE]

I was just going to post this.

Felpro that was on it started leaking.

 

[Floyd]

I had good luck with remflex

 

[69ChargerR/TSE]

I had good luck with remflex

They make a flange gasket?

 

[Bee1971]

HP Manifolds

MOPAR Header/Exhaust Manifold Gasket

 

[1 Wild R/T]

Years ago I had one that wouldn't hold a gasket.... Changed it four times.... Picked up a set of new 3/8" thick flanges.. bolted the existing headpipes up to the manifolds with the new flanges sandwiched in the middle... Put a few tack welds on each flange then dropped them down & fully welded the new flanges to the old flanges, bolted it together with new gaskets & hardware... That was probably seven years ago & it hasn't leaked since...

 

[Mackman]

I have one that leaks, I put two gaskets on that side. Get them from NAPA.

 

[69ChargerR/TSE]

I had good luck with remflex

They make a flange gasket

I have one that leaks, I put two gaskets on that side. Get them from NAPA.

what brand?

 

[69ChargerR/TSE]

HP Manifolds

MOPAR Header/Exhaust Manifold Gasket

Looks like a drive to Summit Tuesday.
I did get 7/16-14x2” bolts. It had 3/8” bolts.
Did you use 35# torque or more?
Any RTV or similar?
Was considering a Felpro manifold to head, if it needs to be removed.

 

[Billccm]

I'll second the remflex.

 

[Mackman]

They make a flange gasket

what brand?

They make a flange gasket

what brand?

NAPA #FPG 60025

 

[3white74]

Absolutely 3 Rd on the remflex.....all leaks stopped with them .....or it's leaking elsewhere!!!

 

[Bighouse]

I put Copper RTV on every exhaust gasket. It works for me.

A couple passes with a flat tile too- some of those flanges become banana’d.

 

[Macdon221]

Remflex. Stop right there.