| Re: [GMCnet] Doug Thorley Headers D755Y vs 355YC [message #325890 is a reply to message #325889] |
Thu, 09 November 2017 10:52   |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma:
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Senior Member |
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We sell both, however the 355 is not produced but once a year so the
availability is the problem.
The 355 is primarily designed for the 403 engine and few years ago the late
Joe Mondello and I had the header designed for the 455. This has the O2
bung on the collectors and the flange at the collector has a built in
conical end to allow a perfect seal when aligning the collector to the
header and does away with the donut gasket that crumbles as it gets older.
The 355Y does not always have the 14 gauge , just published.
There is also a trick to torquing the headers that we explain when you
acquire it.
On Thu, Nov 9, 2017 at 8:19 AM, John Wright wrote:
> Hugh,
> The one that has been used over the years has been the 355YC version and
> it does have the thicker tubing which is what you need. Unsure that
> thorley headers are still in production, Jim K now markets the Doug's
> headers and both ceramic and SS headers are available and the price
> difference is small.
>
> http://www.appliedgmc.com/prod.itml/icOid/1610
>
> http://www.appliedgmc.com/prod.itml/icOid/672
>
> Contact Jim with your questions.
>
> 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 Nov 9, 2017, at 8:22 AM, Beach Coach wrote:
>>
>> Can anyone clarify which header; the D755Y and/or 355YC; can be used as
> replacements for the exhaust manifolds? The only difference between the two
>> headers is that the D755Y is made with 16 gauge steel and the 355YC is
> made with 14 gauge steel. The sales specs for both headers are stating that
>> they are a fit for the GMC Motorhome 1973 - 1978.
>>
>> Thanks
>>
>> Hugh MacDougall, Antigonish Nova Scotia Canada, 1975 Eleganza II
>> --
>> hugh MacDougall
>> Antigonish, Nova Scotia
>> 1975 Eleganza II, 1977 Trans Mode
>>
>>
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--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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