GM Exhaust sealant

Brianw36 · 08-11-2018, 01:42 PM

I recently separated primary and secondary cats from the LT1. The connection point to the second cat had a flexible gasket that looked like permatex. Does anyone know the part number GM uses for this. It looks to be designed to seal the 2 cats with the band in place.

oldman · 08-11-2018, 04:25 PM

I asked the same question, cause the GM stuff works, never got an answer.

glenB · 08-11-2018, 09:06 PM

gm #12378521 sealant

Brianw36 · 08-11-2018, 09:48 PM

Quote:

Originally Posted by glenB

gm #12378521 sealant

I believe this is sealant for oil pans and gasket replacement but not exhaust. I can't find anywhere it mentions temperature rating. The gasket like piece did not look just like a sealant only. It looked to have aluminum and sealant as one piece. Thanks for the part number.

JCunningham · 08-12-2018, 12:15 AM

you talking about the gasket on the drivers side pipe. If yours was sealant then its been apart befor. it supposed to be a metal gasket.

Brianw36 · 08-12-2018, 08:45 AM

Jcunningham. I'm not talking about that gasket. It goes around the connection joint of the primary and secondary cats, under the band clamp. It looks like they put it there to seal up the gap. I'm trying to see if I can find what it looked like to show a picture.

oldman · 08-12-2018, 09:52 AM

Mine, after 4000 miles was still wet/elastic. If formed a great seal. I say it is proof positive that aliens are here and evidently work at GM. I would like to use it again on my band clamps and slip joints..

something like this:
http://www.aircraftspruce.com/catalo...rmatexprod.php

"
High Temperature Gasket Sealant is a slow drying viscous paste. It remains pliable and flexible and is designed to seal flanges, threaded connections and fasteners at temperatures from -45° C to +315 "

Brianw36 · 08-12-2018, 02:53 PM

Quote:

Originally Posted by oldman

Mine, after 4000 miles was still wet/elastic. If formed a great seal. I say it is proof positive that aliens are here and evidently work at GM. I would like to use it again on my band clamps and slip joints..

something like this:
http://www.aircraftspruce.com/catalo...rmatexprod.php

"
High Temperature Gasket Sealant is a slow drying viscous paste. It remains pliable and flexible and is designed to seal flanges, threaded connections and fasteners at temperatures from -45° C to +315 "

Yes. It was still wet and elastic. It has to have a higher temp rating than that stuff. I would imagine pipes get really hot there. I want to use it for my kooks header collector joint and off road pipe.

KyBoy · 08-12-2018, 03:45 PM

This what your talking about?

Heath

Brianw36 · 08-12-2018, 03:52 PM

Quote:

Originally Posted by KyBoy

This what your talking about?

Heath

That is it. You are the man. Now just need to find out part number. Thanks

KyBoy · 08-12-2018, 03:59 PM

Quote:

Originally Posted by Brianw36

That is it. You are the man. Now just need to find out part number. Thanks

Welcome, that's from my wife's 1SS. Mine got destroyed getting it off, it was the blind leading the blind when I was doing it. After I knew what to expect, her exhaust was much easier to remove.

Sorry I dont know a part number.

Heath

Mark114 · 08-12-2018, 05:18 PM

Unfortunately the factory service manual seems to show that as a single part for the clamp and gasket (#5) if this is the part you're looking for. The repair procedure is to discard and replace with a new clamp. The clamp was around $80 on the web site I checked.

Catalytic Converter Clamp - GM (22860193)

KyBoy · 08-12-2018, 05:34 PM

Quote:

Originally Posted by Mark114

Unfortunately the factory service manual seems to show that as a single part for the clamp and gasket (#5) if this is the part you're looking for. The repair procedure is to discard and replace with a new clamp. The clamp was around $80 on the web site I checked.

Catalytic Converter Clamp - GM (22860193)

That's about what I figured. I didn't think it would come in a tube.

Heath

Brianw36 · 08-12-2018, 06:32 PM

Well that stinks. I just want the gasket.

08-11-2018, 04:25 PM	#2
oldman Drives: SS 6 speed of course Join Date: Jan 2016 Location: Hilo, HI Posts: 4,316	I asked the same question, cause the GM stuff works, never got an answer. __________________ Forged short block, large duration sub .600 lift Cam Motion cam, 7200 RPM fuel cut, Pray Ported Heads, 3.85 pulley D1X, stage II intercooler, DSX secondary low side, DSX E85 sensor, Lingenfelter big bore 2.0 pump, ported front cats, 60608 Borla, LT4 injectors, ZL1 1LE driveshaft and Katech ported TB, ported MSD intake, BTR valvetrain, ARP studs, ProFlow valves, PS4 tires.

08-12-2018, 08:45 AM	#6
Brianw36 SNSTRSS Drives: 2016 Camaro 2SS A8 Join Date: May 2016 Location: North Florida Posts: 583 View My Garage	Jcunningham. I'm not talking about that gasket. It goes around the connection joint of the primary and secondary cats, under the band clamp. It looks like they put it there to seal up the gap. I'm trying to see if I can find what it looked like to show a picture. __________________ 2016 Black Camaro 2SS A8 NP

08-12-2018, 09:52 AM	#7
oldman Drives: SS 6 speed of course Join Date: Jan 2016 Location: Hilo, HI Posts: 4,316	Mine, after 4000 miles was still wet/elastic. If formed a great seal. I say it is proof positive that aliens are here and evidently work at GM. I would like to use it again on my band clamps and slip joints.. something like this: http://www.aircraftspruce.com/catalo...rmatexprod.php " High Temperature Gasket Sealant is a slow drying viscous paste. It remains pliable and flexible and is designed to seal flanges, threaded connections and fasteners at temperatures from -45° C to +315 " __________________ Forged short block, large duration sub .600 lift Cam Motion cam, 7200 RPM fuel cut, Pray Ported Heads, 3.85 pulley D1X, stage II intercooler, DSX secondary low side, DSX E85 sensor, Lingenfelter big bore 2.0 pump, ported front cats, 60608 Borla, LT4 injectors, ZL1 1LE driveshaft and Katech ported TB, ported MSD intake, BTR valvetrain, ARP studs, ProFlow valves, PS4 tires. Last edited by oldman; 08-12-2018 at 10:13 AM.

08-12-2018, 03:45 PM	#9
KyBoy Drives: '17 2SS H50 Join Date: Mar 2016 Location: Louisa, Ky Posts: 3,952	This what your talking about? Heath __________________ 2017 H50-2SS-MN6-F55-NPP-RIK-WL4-IO6 1100 - 5/26 0000 - Cancelled - 7/5 Contacted Becky - 7/1 2000 - 7/5 3000 - 7/6 3000 - 7/11 TPW 8/1 3100 - 7/18 TPW 8/1 3300 - 7/20 3400 - 7/21 Built - 8/2 - PS 1,182/1 of 699US 4300 - 8/3 5000 - 8/5 6000 - 8/13

08-12-2018, 06:32 PM	#14
Brianw36 SNSTRSS Drives: 2016 Camaro 2SS A8 Join Date: May 2016 Location: North Florida Posts: 583 View My Garage	Well that stinks. I just want the gasket. __________________ 2016 Black Camaro 2SS A8 NP

08-11-2018, 01:42 PM	#1
Brianw36 SNSTRSS Drives: 2016 Camaro 2SS A8 Join Date: May 2016 Location: North Florida Posts: 583 View My Garage	GM Exhaust sealant I recently separated primary and secondary cats from the LT1. The connection point to the second cat had a flexible gasket that looked like permatex. Does anyone know the part number GM uses for this. It looks to be designed to seal the 2 cats with the band in place. __________________ 2016 Black Camaro 2SS A8 NP

08-11-2018, 09:06 PM	#3
glenB Drives: Chevrolet Camaro SS Join Date: Mar 2015 Location: Planet Earth Posts: 721	gm #12378521 sealant

08-12-2018, 12:15 AM	#5
JCunningham Drives: 2017 2SS M6 Join Date: Jun 2013 Location: WNY Posts: 7,070	you talking about the gasket on the drivers side pipe. If yours was sealant then its been apart befor. it supposed to be a metal gasket. __________________ real ZL1 wheels and brakes, 285/305 Michelin Pilot Super Sports, Pray ported Intake manifold, Soler Throttle Body, Rotofab intake, EFI Tuning Flex fuel kit, full American Racing Headers Exhaust, 1 7/8" w/ cats H pipe and mufflers. Full 1LE suspension, with BMR adjustable sway bars and links, GM aluminum cradle bushings, Hurst shifter with lighter reverse spring, TWM shifter knob, Tick level 1 transmission. I should have bought a ZL1

08-12-2018, 05:18 PM	#12
Mark114 Drives: 2016 2SS Convertible Join Date: May 2012 Location: St. Louis, MO Posts: 1,710 View My Garage	Unfortunately the factory service manual seems to show that as a single part for the clamp and gasket (#5) if this is the part you're looking for. The repair procedure is to discard and replace with a new clamp. The clamp was around $80 on the web site I checked. Catalytic Converter Clamp - GM (22860193) Attached Images

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