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 #325905 is a reply to message #325895] |
Thu, 09 November 2017 21:09   |
k2gkk
Messages: 4452
Registered: November 2009
Karma:
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Here's an eBay item that very well might help.
http://www.ebay.com/itm/302333843484
The seller here has other sizes.
D C "Mac" Macdonald
Amateur Radio K2GKK
Since 30 November '53
USAF and FAA, Retired
Member GMCMI & Classics
Oklahoma City, OK
"The Money Pit"
TZE166V101966
'76 ex-Palm Beach
k2gkk + hotmail dot com
[http://i.ebayimg.com/images/i/302333843484-0-1/s-l1000.jpg]
DEI Heat Protection Sheath Aluminized Sleeving 1" x 36" Wire & Hose Shielding | eBay
www.ebay.com
Heat Sheath is constructed from a Hi-Temp fiberglass fabric bonded to an aluminized material with sides sewn together forming a sleeve. Heat Sheath will reflect up to 90% of the radiant heat and insulates up to 500°F direct continuous heat. | eBay!
________________________________
From: Gmclist on behalf of James Hupy
Sent: Thursday, November 9, 2017 14:20
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Doug Thorley Headers D755Y vs 355YC
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
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