Thanks guys.....I likely have that info here in my 24,182 messages, but
finding it when required is another thing.
Thanks for the happy thought Jim
Mike in NS
> What John said! I have Doug Thornley headers on my 78 403. They were on it
> when I bought it from the second owner in 2008. It had 87,000 miles then.
> Now, 9 years later and 140,000 miles, the Remflex gaskets, as well as the
> coating on the headers are still good. I don't think iron manifolds last
> that well. Make sure both gasket surfaces are flat, chase all the threads,
> DON'T OVERTORQUE THEM, and you should be good to go. Oh yeah, be sure and
> fire sleeve your speedometer cable. It comes really close to the headers.
> It will melt and bind your cable, and strip out your governor gear in the
> transmission.
> Jim Hupy
> Salem, Or
> 78 GMC ROYALE 403
>
>
> Michael,
>
> I have used a number of exhaust gaskets over the years from the Thorley
> header gaskets when I first got headers in 2003. The ones that I have used
> on the original manifolds and on the header is the Remflex Gaskets.
>
> You want the Remflex part# 11-001 for headers and they work for both the
> 403 and 455.
>
> If you are still using the stock exhaust manifolds then you want Remflex
> part# 11-003. Fit both the 403 and 455.
>
>
http://www.appliedgmc.com/prod.itml/icOid/670
>
> I have both them from local autoparts stores and they have been cheaper
> from Jim K and that includes postage too.
>
> Follow the instruction on the package and DO NOT torque them over the
> suggested 14 to 18 ftlbs and I have always used 15 ftlbs for the headers.
> The stock manifold torque specs are 20 ftlbs. Put them in and torque them
> and then drive 500 miles and then just check the torque again. The center
> top bolt should be tighten to no more that 8 ftlbs and you can cock the
> headers and stock manifolds and cause gasket failure.
>
> JR Wright
> GMC Great Laker MHC
> GMC Eastern States Charter Member
> GMCGL Tech Editor
> GMCMI
> 78 GMC Buskirk 30’ Stretch
> 1975 GMC Avion (Under Reconstruction)
> Michigan
>
> > On Aug 8, 2017, at 3:59 PM, Kingsley Coach
> >
> > Netters
> >
> > Is there a header gasket that WORKS for a 403?
> > Which one would it be?
> >
> > Thanks
> >
> > Mike in NS
> >
> > --
> > Michael Beaton
> > 1977 Kingsley 26-11
> > 1977 Eleganza II 26-3
> > Antigonish, NS
> >
> > Life is too short to hold a grudge; slash some tires and call it even !
> > _______________________________________________
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--
Michael Beaton
1977 Kingsley 26-11
1977 Eleganza II 26-3
Antigonish, NS
Life is too short to hold a grudge; slash some tires and call it even !
