Home » Public Forums » GMCnet » Header wrap
| Header wrap [message #131849] |
Fri, 24 June 2011 13:01  |
biggreen
Messages: 347
Registered: June 2011
Location: Northeast Florida
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I've decided on headers since my exhaust manifolds leak and are corroded. I've read not to waste $ on ceramic coating as it will burn off in time. I have used a wrap on headers for muscle and race cars in the past. Anyone use this in a GMC? I would think it would help keep the heat down. Thanks
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| Re: Header wrap [message #131861 is a reply to message #131849] |
Fri, 24 June 2011 13:55  |
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jaholland
Messages: 565
Registered: June 2010
Location: Sweet Home Alebamy
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| biggreen wrote on Fri, 24 June 2011 13:01 |
I've decided on headers since my exhaust manifolds leak a
nd are corroded.
I've read not to waste $ on ceramic coating as it will burn off in time.
I have used a wrap on headers for muscle and race cars in the past.
Anyone use this in a GMC?
I would think it would help keep the heat down.
Thanks
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===================================================
WRAP ~
The first thing that I did when I got my headers
was to get rid of all that wrap ~ They must have
thought the headers were breakable to have taped
all of that bubble wrayp on them and the box ~
I don't know exactly just what kind of tape they
used but it was almost impossible to cut ~
~ Joe ~
/_]*[__][] *[__|] ~ * '73 TZE063V101887 "
"
O----------OO--]* ~ '78 TZE168V100234 "
"
" Joe & Lavelle " "
"
'sweet home alebamy'
[Updated on: Fri, 24 June 2011 13:57] Report message to a moderator |
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| Re: [GMCnet] Header wrap [message #131862 is a reply to message #131849] |
Fri, 24 June 2011 13:58 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
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There's a set of ceramic coated headers on my son's coach which came
with it in '98. IIRC, the records indicated they'd been on there
since '93. With over 80,000 miles on them, they're still in good
shape.
I would NOT wrap headers because of moisture retention and rusting.
JMHO
Ken H.
On Fri, Jun 24, 2011 at 2:01 PM, R.D. Hart wrote:
>
>
> I've decided on headers since my exhaust manifolds leak and are corroded. I've read not to waste $ on ceramic coating as it will burn off in time. I have used a wrap on headers for muscle and race cars in the past. Anyone use this in a GMC? I would think it would help keep the heat down. Thanks
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Ken Henderson
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www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Header wrap [message #131885 is a reply to message #131862] |
Fri, 24 June 2011 18:26 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
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Thorly has now gone 100% to Ceramic coatings as the original nickle
dip was costing them too much.
Doug's headers are doing the same.
Being that our headers stay high enough and not effected by the rocks
hitting them, you'll see that it will survive.
Header manufactures refuse to honor warranty if they have been wrapped.
Keep in mind that only Doug's headers have the 455 flange, the
Thorley's might go there on the next batch,
Doug's come standard with Oxy sensor bungs on each side on the collector.
They are in stock
On Fri, Jun 24, 2011 at 11:58 AM, Ken Henderson <hend4800@bellsouth.net> wrote:
> There's a set of ceramic coated headers on my son's coach which came
> with it in '98. Â IIRC, the records indicated they'd been on there
> since '93. Â With over 80,000 miles on them, they're still in good
> shape.
>
> I would NOT wrap headers because of moisture retention and rusting.
>
> JMHO
>
> Ken H.
>
> On Fri, Jun 24, 2011 at 2:01 PM, R.D. Hart wrote:
>>
>>
>> I've decided on headers since my exhaust manifolds leak and are corroded. Â I've read not to waste $ on ceramic coating as it will burn off in time. Â I have used a wrap on headers for muscle and race cars in the past. Â Anyone use this in a GMC? Â I would think it would help keep the heat down. Â Thanks
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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www.appliedgmc.com
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| Re: [GMCnet] Header wrap [message #131888 is a reply to message #131886] |
Fri, 24 June 2011 18:51 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
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Yes, and we found no degradation on low end torque when Joe Mondello
did it with a dyno.
On Fri, Jun 24, 2011 at 4:37 PM, R.D. Hart <regor5556@yahoo.com> wrote:
>
>
> So, Jim, do these headers fit a 403?
> _______________________________________________
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--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] Header wrap [message #131944 is a reply to message #131888] |
Sat, 25 June 2011 07:12 |
Jim Bounds
Messages: 842
Registered: January 2004
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In the initial testing of our Koba Motor program, we did a dyno pull with
headers and with stock manifolds, the results were so close as to not bear
comparison. There was actually a little rise in torque just off idle with the
original manifolds but like I said it was too small to really note.
You do not install headers for increased performance, the scavange effect
headers give you does not really kick in under 3000 rpm, the main reason you
install them is the cast manifolds are cracking. Thedriver saide manifold can
only be resurfaced slightly before there is not adequite clearance for the oil
dip stick tue to pass between it and the head. That along with having a off
pressure 5 bolt pattern, it really is only a matter of time until the manifolds
need to be given a gold watch for their past services. Every motor we install
gets header sets, I mean if the intent is to offer a reliable drive train,
original manifold simply "CAN'T HOLD THE SMOKE"! If everything works flawless
but the exhaust manifolds constantly blow out gaskets-- what have you
accomplished.
There are several issues that time has made us address, this is one of them.
It's a bummer but there it is. I get my Doug Thorley header sets through Jim
K., I would suggest getting them there as well,
Jim Bounds
-----------------------
----- Original Message ----
From: Jim Kanomata <jimkanomata@gmail.com>
To: gmclist@temp.gmcnet.org
Sent: Fri, June 24, 2011 7:51:30 PM
Subject: Re: [GMCnet] Header wrap
Yes, and we found no degradation on low end torque when Joe Mondello
did it with a dyno.
On Fri, Jun 24, 2011 at 4:37 PM, R.D. Hart <regor5556@yahoo.com> wrote:
>
>
> So, Jim, do these headers fit a 403?
> _______________________________________________
> GMCnet mailing list
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--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] Header wrap [message #131977 is a reply to message #131944] |
Sat, 25 June 2011 13:31 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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I have seen the data that Jerry Jarden and Doug Thorly published back in 1995.
It was done with an comparison on the dyno with closed system and also open.
As I remember, there was a gain from 2,000-2900.
They were using the 0ne that was designed for 403 engine as Jerry
Jarden had a 78 MH.
Now we have Doug"s headers from Pertronics that are designed for use
on both 403 and 455.
The late Joe Mondello told me that the new one showed increase in the
range from 2,000-3200.
On Sat, Jun 25, 2011 at 5:12 AM, Jim Bounds <gmccoop@yahoo.com> wrote:
> In the initial testing of our Koba Motor program, we did a dyno pull with
> headers and with stock manifolds, the results were so close as to not bear
> comparison. There was actually a little rise in torque just off idle with the
> original manifolds but like I said it was too small to really note.
>
>
> You do not install headers for increased performance, the scavange effect
> headers give you does not really kick in under 3000 rpm, the main reason you
> install them is the cast manifolds are cracking. Thedriver saide manifold can
> only be resurfaced slightly before there is not adequite clearance for the oil
> dip stick tue to pass between it and the head. That along with having a off
> pressure 5 bolt pattern, it really is only a matter of time until the manifolds
> need to be given a gold watch for their past services. Every motor we install
> gets header sets, I mean if the intent is to offer a reliable drive train,
> original manifold simply "CAN'T HOLD THE SMOKE"! If everything works flawless
> but the exhaust manifolds constantly blow out gaskets-- what have you
> accomplished.
>
> There are several issues that time has made us address, this is one of them.
> It's a bummer but there it is. I get my Doug Thorley header sets through Jim
> K., I would suggest getting them there as well,
>
> Jim Bounds
> -----------------------
>
>
>
> ----- Original Message ----
> From: Jim Kanomata <jimkanomata@gmail.com>
> To: gmclist@temp.gmcnet.org
> Sent: Fri, June 24, 2011 7:51:30 PM
> Subject: Re: [GMCnet] Header wrap
>
> Yes, and we found no degradation on low end torque when Joe Mondello
> did it with a dyno.
>
> On Fri, Jun 24, 2011 at 4:37 PM, R.D. Hart <regor5556@yahoo.com> wrote:
>>
>>
>> So, Jim, do these headers fit a 403?
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>
>
>
>
> --
> Jim Kanomata
> Applied/GMC, Fremont,CA
> jimk@appliedairfilters.com
> http://www.appliedgmc.com
> 1-800-752-7502
> _______________________________________________
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>
> _______________________________________________
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--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] Header wrap [message #132079 is a reply to message #132077] |
Sun, 26 June 2011 09:41 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Depending on which tuner that you believe, and the combination of heads,
manifolds, headers, cam, compression ratios that you are using, the effect
would be from a loss of power at certain RPMs, to a slight gain at a RPM
range where we do not generally run our GMC engines. What works for a fairly
lightweight vehicle with numerically high differential gearing, around 4:10
or so, does not have the same effect on a 12,000 pound vehicle with highway
gearing. In other words, no easy answer.
Jim Hupy
Salem, OR
78 GMC Royale 403
On Sun, Jun 26, 2011 at 7:31 AM, 1104agm <1104agm@gmail.com> wrote:
> What is the affect of grinding the bump put of the exhaust port of the
> heads. Does it reduce the low end torque or what? I have a set of heads
> that these were ground out of. In fact because of a cracked head one of
> these is on the engine now. Well I am assuming cracked head since it leaked
> water and filled a cylinder with water. The head had been milled flat when
> I had a valve job done on it.
>
> Art & Doris
> EL 76
> On Jun 25, 2011, at 10:39 PM, Rob Mueller wrote:
>
> > Larry,
> >
> > If you're talking about the vent I reckon it would be easier to install:
> >
> > http://www.appliedgmc.com/prod.itml/icOid/866
> >
> > Ken Frey installed a 90° air line fitting in Double Trouble. He said
> there
> > was just enough room to get a tap in there and he greased it to hold the
> > sworf. It must have been OK as I've put about 12K miles on since he did
> it.
> >
> >
> > Regards,
> > Rob M.
> > Sydney, Australia
> > AUS '75 Avion-The Blue Streak TZE365V100428
> > USA '75 Avion-Double Trouble TZE365V100426
> >
> >
> > -----Original Message-----
> > From: Larry
> >
> > I have wondered if it would be worth while to wrap the exhaust where the
> > tranny over flow would pour out fluid. Anything to keep from flaming up.
> >
> > my thought
> > --
> > Gatsbys' CRUISER :d
> > 74 GLACIER X, 260
> > 455/APC/4 bagg'r(ver3)
> > Remflex Manifold gaskets
> >
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
> _______________________________________________
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The Manifold exh gasket had been replaced. By the time I returned home, about 2000 miles, they were blown out again. Sounded like a truck.
