| Thorley Headers [message #197622] |
Wed, 06 February 2013 20:53  |
kerry pinkerton
Messages: 2565
Registered: July 2012
Location: Harvest, Al
Karma: 15
|
Senior Member |
|
|
Have a chance to buy some gently used Thorley Headers that came off a 455. Will they fit on a 403? If not, is the problem something that can be fixed with some fabrication or movement of something else?
Kerry Pinkerton - North Alabama
Had 5 over the years. Currently have a '06 Fleetwood Discovery 39L
|
|
|
|
|
|
|
|
|
|
| Re: [GMCnet] Thorley Headers [message #197657 is a reply to message #197622] |
Thu, 07 February 2013 06:37  |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
|
Senior Member |
|
|
If you can't use them, please have the seller email me off list - I'll take a set for my PB rehab if the price is right.
--johnny
'76 23' transmode norris
'76 palm beach
From: Kerry Pinkerton <Pinkertonk@MCHSI.com>
To: gmclist@temp.gmcnet.org
Sent: Wednesday, February 6, 2013 9:53 PM
Subject: [GMCnet] Thorley Headers
Have a chance to buy some gently used Thorley Headers that came off a 455. Will they fit on a 403? If not, is the problem something that can be fixed with some fabrication or movement of something else?
--
Kerry Pinkerton
North Alabama, near Huntsville,
77 Eleganza II, "The Lady", 403CI, also a 76 Eleganza being re-bodied as an Art Deco car hauler
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
|
|
|
|
|
|
|
|
| Re: Thorley Headers [message #197764 is a reply to message #197622] |
Fri, 08 February 2013 00:46 |
 |
mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
Karma: 0
|
Senior Member |
|
|
| Kerry Pinkerton wrote on Wed, 06 February 2013 18:53 |
Have a chance to buy some gently used Thorley Headers that came off a 455. Will they fit on a 403? ...
|
The way I understand it, Thorley Headers were designed using a 403 equiped motorhome as a test bed. Dougs Headers were designed on a 455.
But... either will work on the other.
(Just how I understand it... it might even be true!)
Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo'
http://m000035.blogspot.com
|
|
|
|
|
|
| Re: [GMCnet] Thorley Headers [message #197775 is a reply to message #197767] |
Fri, 08 February 2013 07:33 |
C Boyd
Messages: 2629
Registered: April 2006
Karma: 18
|
Senior Member |
|
|
Rob: the 403 and the 455 MH and Toro share the same stock left exhaust manifold, the stock 403 right manifold has a kink above the oil filter cooler adapter cause the 403 is a small block and is shorter. They both have the same bolt pattern and use the same gasket. The older Thorleys were made for both till Joe and Doug got together and designed a set with thicker flanges to reduce warpage supposiedly for 455 MH but would fit both as I understand it.
| Robert Mueller wrote on Fri, 08 February 2013 03:54 |
Mike,
Your comment fired a brain cell
IIRC while the Thorley's for a 403 will fit a 455 the exhaust ports on a 403 are smaller and therefore the flange is smaller.
Regards,
Rob M.
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
-----Original Message-----
From: Mike Miller
Kerry Pinkerton wrote on Wed, 06 February 2013 18:53
> Have a chance to buy some gently used Thorley Headers that came off a 455. Will they fit on a 403? ...
The way I understand it, Thorley Headers were designed using a 403 equiped motorhome as a test bed. Dougs Headers were designed on
a 455.
But... either will work on the other.
(Just how I understand it... it might even be true!)
--
Mike
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
C. Boyd
76 Crestmont
East Tennessee
|
|
|
|
| Re: [GMCnet] Thorley Headers [message #197917 is a reply to message #197775] |
Fri, 08 February 2013 23:49 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
|
Senior Member |
|
|
Chuck,
Now, both are almost a spiting imiage of each other, Late2012.
We stock both.
The most visaable is in the collector bung. Doug's use the perment steel
bung, thorly uses the traditional fiberous bung.
We were asked by both to show them where they should locate the O2 sensor
bung. My guys had a big laugh when they sent us identical headers for us to
mark.
On Fri, Feb 8, 2013 at 5:33 AM, Charles Boyd <covered-wagon@comcast.net>wrote:
>
>
> Rob: the 403 and the 455 MH and Toro share the same stock left exhaust
> manifold, the stock 403 right manifold has a kink above the oil filter
> cooler adapter cause the 403 is a small block and is shorter. They both
> have the same bolt pattern and use the same gasket. The older Thorleys were
> made for both till Joe and Doug got together and designed a set with
> thicker flanges to reduce warpage supposiedly for 455 MH but would fit both
> as I understand it.
>
>
>
>
> Robert Mueller wrote on Fri, 08 February 2013 03:54
> > Mike,
> >
> > Your comment fired a brain cell
> >
> > IIRC while the Thorley's for a 403 will fit a 455 the exhaust ports on a
> 403 are smaller and therefore the flange is smaller.
> >
> > Regards,
> > Rob M.
> > Sydney, Australia
> > AUS '75 Avion-The Blue Streak TZE365V100428
> > USA '75 Avion-Double Trouble TZE365V100426
> >
> >
> > -----Original Message-----
> > From: Mike Miller
> >
> > Kerry Pinkerton wrote on Wed, 06 February 2013 18:53
> > > Have a chance to buy some gently used Thorley Headers that came off a
> 455. Will they fit on a 403? ...
> >
> > The way I understand it, Thorley Headers were designed using a 403
> equiped motorhome as a test bed. Dougs Headers were designed on
> > a 455.
> >
> > But... either will work on the other.
> >
> > (Just how I understand it... it might even be true!)
> >
> > --
> > Mike
> >
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
>
> --
> C. Boyd
> 76 Crestmont
> East Tennessee
> _______________________________________________
> 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
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
|
|
|
|
| Re: [GMCnet] Thorley Headers [message #197918 is a reply to message #197917] |
Sat, 09 February 2013 00:11 |
 |
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
|
Senior Member |
|
|
Jim,
So as of late 2012 the port sizes in Doug Thorley headers and Doug's headers are the same?
Regards,
Rob M.
-----Original Message-----
From: Jim Kanomata
Chuck,
Now, both are almost a spiting imiage of each other, Late2012.
We stock both.
The most visaable is in the collector bung. Doug's use the perment steel
bung, thorly uses the traditional fiberous bung.
We were asked by both to show them where they should locate the O2 sensor
bung. My guys had a big laugh when they sent us identical headers for us to
mark.
Jim
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
|
|
|
|
GMCforum
Search
Help
Register
Login
Home
