Home » Public Forums » GMCnet » Header Gasket (I need to replace my passenger side header gasket)
| Re: [GMCnet] Header Gasket [message #329280 is a reply to message #329279] |
Mon, 19 February 2018 10:32   |
emerystora
Messages: 4442
Registered: January 2004
Karma:
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Senior Member |
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> On Feb 19, 2018, at 9:16 AM, Russell Keith wrote:
>
> On a recent trip, our GMC ('78 403) developed an exhaust noise. On Saturday I found the exhaust leak at the number 8 cylinder where it looks like a
> small piece of the header gasket broke and blew out. I ordered the Mr. Gasket 7170 copper gasket to put in. I have older Thorley headers (date
> unknown). My questions are: 1) Do I need to remove the AC bracket to removed the passenger side header?
1. No it is not necessary to remove the A/C bracket.
> 2) Which RTV gasket sealer should I use, if
> any?
I used a thin coating of Permatex Ultra Copper on both sides of the copper gasket.
> 3) Should I replace the donut gasket at the same time?
Only if it’s leaking.
> 4) Can I replace the gasket with just top and bottom access (jacked up), or do I need to
> remove the fender well liner?
>
No need to jack it up or take out the liner. You can do it all from the top. Only remove the bolts which go through holes in the copper gasket. Where there are slots loosen the bolts but leave the header attacked but hang ing loose. Slip the gasket down behind the header, hanging it on the bolts, and replace the removed bolts and tighten all bolts.
> Any tips or tricks are greatly appreciated. Thanks.
Note— after a few years the copper gaskets burned out and I replaced them with the composite Remflex gaskets the Applied GMC sells. They have lasted fine for the last 10,000 miles.
Emery Stora
> --
> Russell Keith,
> 1978 Eleganza II "Harry" 403, Danny Dunn Tranny (w/shift kit, 3.50 sprockets, Allison), Thorley, Stock Brakes w/Remote Vacuum Brake Booster, Mico
> Electric Actuated brake lock, Dakota Digital Dash, 6.5kW Onan,
> Dunedin, Florida
>
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