| Header / exhaust. Installation [message #156541] |
Thu, 12 January 2012 22:10  |
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John Heslinga
Messages: 632
Registered: February 2011
Location: Edmonton, Alberta, Canada
Karma: 4
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Senior Member |
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Hi All:
I am currently installing a new 3inch exhaust and headers from Jim K. I've seen posts of people who melt the inner fenders. The only solution I remember suggested was to throw away the inner fenders. That is not a choice I would like to make. Canadian roads have too much dirt that kicks onto the engine. Is the melting common to most of your installations? What kinds of pre-emptive Solutions have you used or did you just not have that big a problem. What other elegant heat protection strategies have you used for speed cable?
John and Cathie Heslinga
1974 Canyonlands 260
455, Manny tranny and 1 ton, 3:70 LS,
Red Seal Journeyman, DTE, BEd. MEd.
Edmonton, Alberta
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| Re: Header / exhaust. Installation [message #156545 is a reply to message #156541] |
Thu, 12 January 2012 22:44  |
GeorgeRud
Messages: 1380
Registered: February 2007
Location: Chicago, IL
Karma: 0
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Senior Member |
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There is a spot where the passenger side header is close to the inner fender liner, and people have trimmed that section of the liner away to allow for more room. I'd mount the headers , then the inner fender liner, and take a look through the engine hatch in the coach to see where to trim.
When I installed my kit from JimK, the most trouble I had was with the engine oil dipstick. I had to remove it to fit the header into place, and it didn't come out in one piece. Some Kroil or other penetrant on the base of the tube for a day or two should help.
The rest of the kit went together well and I really like the sound and fit of his kit. I got the two muffler kit, so I can't comment on the rear muffler kit, but they seem like a high quality addition.
BTW, JimK says not to worry about replacing the exhaust pipe rubber holders along the passenger side, just slide the tubing through.
George Rudawsky
Chicago, IL
75 Palm Beach
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| Re: [GMCnet] Header / exhaust. Installation [message #156548 is a reply to message #156547] |
Thu, 12 January 2012 23:26 |
zhagrieb
Messages: 676
Registered: August 2009
Location: Portland Oregon
Karma: 0
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Senior Member |
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I've had the Thorley headers for several years with no trimming of and no damage to the fender liners. Also, I went for the single muffler on the 3" kit to keep the living area floor cooler.
Glenn
Glenn Giere, Portland OR, K7GAG
'73 "Moby the Motorhome" 26'
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| Re: Header / exhaust. Installation [message #156569 is a reply to message #156541] |
Fri, 13 January 2012 11:00 |
rvanwin
Messages: 325
Registered: April 2007
Location: Battlefield, MO
Karma: 6
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Senior Member |
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| John Heslinga wrote on Thu, 12 January 2012 22:10 |
Hi All:
I am currently installing a new 3inch exhaust and headers from Jim K. I've seen posts of people who melt the inner fenders. The only solution I remember suggested was to throw away the inner fenders. That is not a choice I would like to make. Canadian roads have too much dirt that kicks onto the engine. Is the melting common to most of your installations? What kinds of pre-emptive Solutions have you used or did you just not have that big a problem. What other elegant heat protection strategies have you used for speed cable?
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I got some thin aluminum sheeting and riveted it onto the wheel liner (inner fender). I used a couple of washers to stand it away from the liner to allow air flow between the liner and sheeting. Easy and no issues with the headers.
Randy & Margie
'77 Eleganza II '403'
Battlefield, MO
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| Re: [GMCnet] Header / exhaust. Installation [message #156598 is a reply to message #156569] |
Fri, 13 January 2012 18:56 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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I didn't think ahead like Randy, so I had to pop rivet aluminum in place of
the melted-away ABS on the passenger side inner wheel well liner -- 10+
years ago.
Ken H.
On Fri, Jan 13, 2012 at 12:00 PM, Randy Van Winkle wrote:
>
> I got some thin aluminum sheeting and riveted it onto the wheel liner
> (inner fender). I used a couple of washers to stand it away from the liner
> to allow air flow between the liner and sheeting. Easy and no issues with
> the headers.
> --
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: Header / exhaust. Installation [message #156639 is a reply to message #156541] |
Fri, 13 January 2012 23:27 |
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John Heslinga
Messages: 632
Registered: February 2011
Location: Edmonton, Alberta, Canada
Karma: 4
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Senior Member |
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Thanks for the advice.
During my current engine and transmission rebuild, I re-bent the transmission oil cooler lines so they hug the engine a little closer. (No use adding heat to the transmission oil because they were close to the header) the Engine oil lines and electrical on the passanger side also got tucked closer to the engine as well, but that was also because I put in a knock sensor and the bracket for the fan venturi ring impinged on the connector. Adapting the bracket forced me to move the cooler lines slightly. At some point I will post those pictures. I'll evaluate the triming however: I like the aluminium solution. Maybe even replace the 2 to 3 inches ahead of time. My Headers are ceramic coated, so there should be a little less heat and the protection should help. Some spacers under the sheet should protect the fender well.
I'll make that heat shield in the spring, and post the pictures of the process. Right now the Engine, Transmission, 3:70 diff, 1 ton front End, Fuel Injection Infrastructure,and rewiring, is taking all the time I have
Thanks again.
John and Cathie Heslinga
1974 Canyonlands 260
455, Manny tranny and 1 ton, 3:70 LS,
Red Seal Journeyman, DTE, BEd. MEd.
Edmonton, Alberta
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| Re: [GMCnet] Header / exhaust. Installation [message #156706 is a reply to message #156639] |
Sat, 14 January 2012 19:53 |
John Wright
Messages: 118
Registered: September 2008
Karma: 0
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Senior Member |
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John,
Do still have the factory 5/16" lines to the cooler? One of the best mods is to change those lines out and replace with 3/8" lines. If allows more flow to the transmission cooler. I also recommend and aux. cooler in series with the cooler in the radiator. Another change would be to move the lines so they are out by the frame rail and then go to the front. Gets the lines away from the exhaust being either manifolds or headers. I did this in 2002 on my other coach. See the attached link:
http://www.gmcmhphotos.com/photos/showphoto.php?photo=7633&cat=3670
You can get the adapter fittings for the 3/8" lines to the transmission from Jim K. He also has a complete for those of you that have difficulty in bending and working with tubing.
http://www.appliedgmc.com/prod.itml/icOid/717
J.R. Wright
GMC GreatLaker
GMCMI
77 Eleganza Custom (For Sale)
1975 Avion (Under Reconstruction)
Michigan
On the road in Tucson
On Jan 13, 2012, at 10:27 PM, John Heslinga wrote:
>
>
> Thanks for the advice.
>
> During my current engine and transmission rebuild, I re-bent the transmission oil cooler lines so they hug the engine a little closer. (No use adding heat to the transmission oil because they were close to the header) the Engine oil lines and electrical on the passanger side also got tucked closer to the engine as well, but that was also because I put in a knock sensor and the bracket for the fan venturi ring impinged on the connector. Adapting the bracket forced me to move the cooler lines slightly. At some point I will post those pictures. I'll evaluate the triming however: I like the aluminium solution. Maybe even replace the 2 to 3 inches ahead of time. My Headers are ceramic coated, so there should be a little less heat and the protection should help. Some spacers under the sheet should protect the fender well.
>
> I'll make that heat shield in the spring, and post the pictures of the process. Right now the Engine, Transmission, 3:70 diff, 1 ton front End, Fuel Injection Infrastructure,and rewiring, is taking all the time I have
>
>
> Thanks again.
> --
> John and Cathie Heslinga
> 1974 Canyonlands 260
> TC4W "Too Cool For Words"
> Retirement Projects Galore
> Edmonton, Alberta
> _____________________________________
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