Heinz:
A year ago last December, I replaced my entire exhaust system at the
time I needed a new muffler.
Went with Thorley headers, Flowmaster mufflers (big block series) and
three inch exhaust pipe after the Y-pipe on my 78 with a 403 ci engine.
Had a muffler shop custom bend the piping between the mufflers and the
Y-pipe.
Prior to installing the system, I sent the parts to Hi Performance
Coating to be coated with an aluminum-ceramic coating. I was after
longevity and as a bonus the coating acts as an insulator and keeps the
engine compartment cooler.
When I assembled the joints, I used band clamps vs. the usual U-bolt
style, which put a crimp in the metal and make it difficult to separate
later when needed.
In conjunction with the 3.42:1 ring and pinion gear installation, I now
have better hill climbing ability on the highways than a stock 455 ci
engined coach.
In case you're not already aware, there is another alternative in
addition to the Jardine system. A fellow in Ontario Canada makes a
stainless steel system. He usually advertises in the GMCMM magazine in
the want ad section, however I didn't find it in the March issue.
Paul Bartz
> rom: Heinz Wittenbecher [SMTP:heinz]
> Sent: Sunday, March 29, 1998 8:11 PM
> Subject: GMC: Project enlarged to include Muffler/Tailpipe.
> Looking for suggestions/recommendations.
>
> My new Thorley Headers are not quite sliding in as a direct
> replacement which means some cutting and welding is going to be
> necessary.
>
> Since my tailpipe past the muffler is 10+ years old and the mufflers
> are of the Muffler Shop variety done as an emergency replacement I'm
> considering to treat the ol' gal to some new ones.
>
> When the Muffler Shop installed the last ones everything got welded.
> Is that really necessary? recommended?
>
> I've seen Flowmasters mentioned/recommended in this list before. I
> presume that's the mufflers?
>
> I would also assume that complete kits are available and while I've
> seen Jardine exhaust kits advertised I've not been paying the greatest
> of attention as there hasn't been the need
>
> So... what is going to be my best bet if replacing new from back
> bumper to Thorley Headers?
>
> Any suggestions/recommendations/experiences greatly appreciated.
>
> Heinz
> '76 Transmode, Vancouver BC (actually Langley).
>
A year ago last December, I replaced my entire exhaust system at the
time I needed a new muffler.
Went with Thorley headers, Flowmaster mufflers (big block series) and
three inch exhaust pipe after the Y-pipe on my 78 with a 403 ci engine.
Had a muffler shop custom bend the piping between the mufflers and the
Y-pipe.
Prior to installing the system, I sent the parts to Hi Performance
Coating to be coated with an aluminum-ceramic coating. I was after
longevity and as a bonus the coating acts as an insulator and keeps the
engine compartment cooler.
When I assembled the joints, I used band clamps vs. the usual U-bolt
style, which put a crimp in the metal and make it difficult to separate
later when needed.
In conjunction with the 3.42:1 ring and pinion gear installation, I now
have better hill climbing ability on the highways than a stock 455 ci
engined coach.
In case you're not already aware, there is another alternative in
addition to the Jardine system. A fellow in Ontario Canada makes a
stainless steel system. He usually advertises in the GMCMM magazine in
the want ad section, however I didn't find it in the March issue.
Paul Bartz
> rom: Heinz Wittenbecher [SMTP:heinz]
> Sent: Sunday, March 29, 1998 8:11 PM
> Subject: GMC: Project enlarged to include Muffler/Tailpipe.
> Looking for suggestions/recommendations.
>
> My new Thorley Headers are not quite sliding in as a direct
> replacement which means some cutting and welding is going to be
> necessary.
>
> Since my tailpipe past the muffler is 10+ years old and the mufflers
> are of the Muffler Shop variety done as an emergency replacement I'm
> considering to treat the ol' gal to some new ones.
>
> When the Muffler Shop installed the last ones everything got welded.
> Is that really necessary? recommended?
>
> I've seen Flowmasters mentioned/recommended in this list before. I
> presume that's the mufflers?
>
> I would also assume that complete kits are available and while I've
> seen Jardine exhaust kits advertised I've not been paying the greatest
> of attention as there hasn't been the need
>
> So... what is going to be my best bet if replacing new from back
> bumper to Thorley Headers?
>
> Any suggestions/recommendations/experiences greatly appreciated.
>
> Heinz
> '76 Transmode, Vancouver BC (actually Langley).
>
