Home » Public Forums » GMCnet » Doug Thorley Headers D755Y vs 355YC (Can both headers be used on a 455?)
| Re: [GMCnet] Doug Thorley Headers D755Y vs 355YC [message #325896 is a reply to message #325895] |
Thu, 09 November 2017 15:08   |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma:
|
Senior Member |
|
|
On Thu, Nov 9, 2017 at 12:20 PM, James Hupy wrote:
> There is a direct relationship between governor gears, speedometer cables,
> transmission shift cables and headers. It is kind of a "Yeahh-Boooo" one.
> Let's say you have a cracked cast iron exhaust manifold, can't find a
> replacement, so, you choose to install a set of headers. If you spend a bit
> of time under the hatch, you will notice that a header tube runs parallel
> and quite close to the speedometer cable, especially if you have a gearing
> change in the final drive and install the correction gearbox with the exit
> cable up instead of down. All that header heat melts the outer covering of
> the speedometer cable, fries the cable lube and before long, the cable
> freezes up. This shears the governor gear, and you need to remove the
> governor to fix the gear. So, along comes the bright idea to move that
> header tube to provide clearance to remove the governor. Ahhh Haaaa,
> problem solved, right? But wait, when the header got re-designed, one of
> the tube now comes close to the transmission selector cable. Guess what
> happens, next. The shift cable does what the speedometer cable did, and you
> can't put your transmission in gear. All that I am saying here is that when
> your headers are installed, your job is only half done. You need to make
> some effective heat shields to protect those cables, no matter which design
> you choose. If not, don't say you didn't read it here before you are broken
> down beside the road.
> Jim Hupy
> Salem, Or
> 78 GMC ROYALE 403 with reduction box, Doug Thorley headers, and new
> speedometer gear and governor gear. Yes, I learned the hard way, but you
> don't have to.
>
> On Nov 9, 2017 11:28 AM, "Larry" wrote:
>
> IMHO, you only need to have one Governor gear go out for that header to pay
> for itself. Lots of us carry an extra gear and there have been a number of
> inquiry's on this net where the trans would not shift out of first and it
> ended up being that governor gear. Just say'n...
> --
> Larry
> 78 Royale w/500 Caddy
> Menomonie, WI.
>
> _______________________________________________
> 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
>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
|
|
|
|
Current Time: Mon May 13 20:44:39 CDT 2024
Total time taken to generate the page: 0.04332 seconds
|
GMCforum
Search
Help
Register
Login
Home
