Exhaust Leak

Carl Stouffer

Carl Stouffer

Well-known member
Jan 15, 2009
4,705
391
83
Tucson, Arizona 85718
Last weekend, on my annual sand dune trip, the coach developed an exhaust leak at the engine. I had a chance to investigate a little further when I
was getting ready to leave the GMCSJ Christmas Rally this morning, and discovered a substantial crack in my left exhaust manifold. I know the left
ones are hard to come by, and I'm wondering if anyone has a good one available that you might be willing to part with for a reasonable price?

The other option, of course, is to install a set of headers, but that's just another large expense. I already have Jim K's 3" aluminized, two
muffler, exhaust system, so the headers should be a simple bolt in installation. Being in my ninth year of GMC ownership, I realize the simple jobs
are rarely as easy as we hopr they will be.

Any sage advice?

Thanks
--
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles,
Solar battery charging
 
Left side (driver) is easiest to find. 455 and 403 are same also Toronado. Cast J. Cast number 407103.

> Last weekend, on my annual sand dune trip, the coach developed an exhaust leak at the engine. I had a chance to investigate a little further when
> I was getting ready to leave the GMCSJ Christmas Rally this morning, and discovered a substantial crack in my left exhaust manifold. I know the
> left ones are hard to come by, and I'm wondering if anyone has a good one available that you might be willing to part with for a reasonable price?
>
> The other option, of course, is to install a set of headers, but that's just another large expense. I already have Jim K's 3" aluminized, two
> muffler, exhaust system, so the headers should be a simple bolt in installation. Being in my ninth year of GMC ownership, I realize the simple
> jobs are rarely as easy as we hopr they will be.
>
> Any sage advice?
>
> Thanks

--
C. Boyd
76 Crestmont
East Tennessee
 
> Left side (driver) is easiest to find. 455 and 403 are same also Toronado. Cast J. Cast number 407103.

Thanks Chuck. I thought it was the opposite. This gives me hope.
--
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles,
Solar battery charging
 
Have some people swear headers are the way to go, other have told me they were not happy after changing to headers because they create so much heat
that they struggle with cooking stuff uner the engine like wires, speedo cables and spark plug boots. ??

You coach is in good shape other then that drivers side manifold I think you can probably find a good manifold and stick with that.

My friends coach has headers, and I did not notice major heat problem, and actually his coach seems quieter then mine. But I stuggle with exhaust
leaks too.

--
Jon Roche
75 palm beach
St. Cloud, MN
http://lqqkatjon.blogspot.com/
 
Jim K's "Doug's Headers" claim to have a high temp ceramic coating that is supposed to not radiate as much heat as the stainless ones. I wonder hoe
effective it is.
--
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles,
Solar battery charging
 
Carl,

Here you go:

http://www.cerakotehightemp.com/?gclid=CK-jhb7m29ACFYKavAodW7oJsw

Regards,
Rob M.
The Pedantic Mechanic
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808


-----Original Message-----
From: Gmclist [mailto:gmclist-bounces] On Behalf Of Carl Stouffer
Sent: Monday, December 05, 2016 11:10 AM
To: gmclist
Subject: Re: [GMCnet] Exhaust Leak

Jim K's "Doug's Headers" claim to have a high temp ceramic coating that is supposed to not radiate as much heat as the stainless
ones. I wonder hoe
effective it is.
--
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels,
Rear American Eagles,
Solar battery charging

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You had ceramic coated thorley headers on The Pig and standard crummy
looking ones on my eleganza 2. Have not noticed a difference in insulation
needs of the motor accessories.

Sully

> Carl,
>
> Here you go:
>
> http://www.cerakotehightemp.com/?gclid=CK-jhb7m29ACFYKavAodW7oJsw
>
> Regards,
> Rob M.
> The Pedantic Mechanic
> USAussie - Downunder
> AUS '75 Avion - The Blue Streak TZE365V100428
> USA '75 Avion - Double Trouble TZE365V100426
> USA '77 Kingsley - TZE 267V100808
>
>
> -----Original Message-----
> From: Gmclist [mailto:gmclist-bounces] On Behalf Of Carl
> Stouffer
> Sent: Monday, December 05, 2016 11:10 AM
> To: gmclist
> Subject: Re: [GMCnet] Exhaust Leak
>
> Jim K's "Doug's Headers" claim to have a high temp ceramic coating that is
> supposed to not radiate as much heat as the stainless
> ones. I wonder hoe
> effective it is.
> --
> Carl Stouffer
> '75 ex Palm Beach
> Tucson, AZ.
> Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive,
> Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels,
> Rear American Eagles,
> Solar battery charging
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
 
My coaches both have headers. They're both different, I suspect the 23' ones are Thorleys and the 26' are Someone Else's. I don't see a lot of heat
relatively, but I've not run a manifold engine for comparison. Both coaches have a fair amount of woven heat fabric around wires and cables which
seems to protect them.

--johnny
--
'76 23' transmode Norris upfit, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
"The road goes on forever, and the party never ends" --Robert Earl Keen
 
Johnny, your 26 is probably a set of Mannys stainless headers. You can remove governor without removing header on his.

> My coaches both have headers. They're both different, I suspect the 23' ones are Thorleys and the 26' are Someone Else's. I don't see a lot of
> heat relatively, but I've not run a manifold engine for comparison. Both coaches have a fair amount of woven heat fabric around wires and cables
> which seems to protect them.
>
> --johnny

--
C. Boyd
76 Crestmont
East Tennessee
 
I have coated dougs headers, and no heat issues.However Iit had them since I have had the coach so no point of comparison.
To be honest though, in other applications I have found they still radiate a LOT of heat, whereas header wraps did make a difference.in underhod
temps
Ran back to back dyne results with bare and wrapped headers and saw now poer difference. However in car, I do think the drop in underhood temps
helped

--
76 Glenbrook
 
This is funny to me becuase back in highschool all the hopped up cars with headers leaked and the ones with manifolds didn't.
--
John Lebetski
Woodstock, IL
77 Eleganza II
Source America First
 
Tru dat. Although the headers I remember in high school leaked because the
collector was too close to the ground and would drag on g outs.

Sully
77 eleganza 2
Seattle

On Mon, Dec 5, 2016 at 6:17 PM John R. Lebetski
wrote:

> This is funny to me becuase back in highschool all the hopped up cars with
> headers leaked and the ones with manifolds didn't.
> --
> John Lebetski
> Woodstock, IL
> 77 Eleganza II
> Source America First
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
 
Carl, find a manifold yet? I have a left you can have for shipping cost. I will try to find out how much it will be. I will need your city
Larry
--
Larry Hopkins
75 Avion
Springfield, IL
 
Thanks Larry! That is very nice of you. I am in Tucson, AZ. I'll PM you with my contact info.
--
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles,
Solar battery charging
 
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