| [GMCnet] Carbs? [message #220487] |
Fri, 30 August 2013 08:23  |
Jeff Marten
Messages: 199
Registered: August 2013
Karma: 1
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Senior Member |
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I've seen references to the coaches having specific carbs, but I've searched and found no real, definitive answer.
Do our coaches have specific carbs? If so, what makes them coach-specific? Are they set up like a marine carb? i.e. a bit fat since they're under load most of the time?
I'd prefer to run an Edelbrock or Holley vs a quadrajunk. I have a nice, rebuilt Eddy 600cfm the PO had installed on my jetboat when I bought it last year. BIG no-no having an automotive carb in an enclosed bilge, plus a Ford 429 needs a bit more than 600cfm. Have an Eddy Marine 750cfm on it now (marginal for the 429 but it was a smokin' deal), would be more than happy to throw it on the coach if beneficial and pick up a Holley 850 for the boat.
Jeff Marten
Colorado Springs, Co
1978 Royale
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1985 Gulf Stream 34' Sun Stream
1964 Falcon 'Vert
1980 Bradley GTE
1999 Chevy Tahoe
2005 Saab 93 Aero
1987 Suzuki Intruder 1400
1978 Glastron/Carlson CV23
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| Re: [GMCnet] Carbs? [message #220488 is a reply to message #220487] |
Fri, 30 August 2013 08:39  |
Steven Ferguson
Messages: 3447
Registered: May 2006
Karma: 0
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Senior Member |
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There are several components that are GMC specific. Our best carb guru,
Dick Patterson, has tried many times to adapt other QJets for use on the
GMC and has pretty much decided it cannot be done. Dicks testing is done
on a dyno, not seat of the pants. If he says it cannot be done, it can't.
There are many out there running aftermarket carbs with success. Same for
aftermarket EFI systems. If you have a correct carb for the GMC, keep it
and play with the aftermarket stuff, or send it to Dick for rebuilding.
Steve F.
On Fri, Aug 30, 2013 at 6:23 AM, Jeff Marten <jtmarten@msn.com> wrote:
> I've seen references to the coaches having specific carbs, but I've
> searched and found no real, definitive answer.
>
> Do our coaches have specific carbs? If so, what makes them
> coach-specific? Are they set up like a marine carb? i.e. a bit fat since
> they're under load most of the time?
>
> I'd prefer to run an Edelbrock or Holley vs a quadrajunk. I have a nice,
> rebuilt Eddy 600cfm the PO had installed on my jetboat when I bought it
> last year. BIG no-no having an automotive carb in an enclosed bilge, plus
> a Ford 429 needs a bit more than 600cfm. Have an Eddy Marine 750cfm on it
> now (marginal for the 429 but it was a smokin' deal), would be more than
> happy to throw it on the coach if beneficial and pick up a Holley 850 for
> the boat.
>
>
>
> Jeff Marten
>
> Colorado Springs, Co
>
> 1978 Royale
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Take care,
Steve
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| Re: [GMCnet] Carbs? [message #220503 is a reply to message #220487] |
Fri, 30 August 2013 10:51 |
A Hamilto
Messages: 4508
Registered: April 2011
Karma: 39
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Senior Member |
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| Jeff Marten wrote on Fri, 30 August 2013 08:23 |
I've seen references to the coaches having specific carbs, but I've searched and found no real, definitive answer.
Do our coaches have specific carbs? If so, what makes them coach-specific? Are they set up like a marine carb? i.e. a bit fat since they're under load most of the time?
I'd prefer to run an Edelbrock or Holley vs a quadrajunk. I have a nice, rebuilt Eddy 600cfm the PO had installed on my jetboat when I bought it last year. BIG no-no having an automotive carb in an enclosed bilge, plus a Ford 429 needs a bit more than 600cfm. Have an Eddy Marine 750cfm on it now (marginal for the 429 but it was a smokin' deal), would be more than happy to throw it on the coach if beneficial and pick up a Holley 850 for the boat.
Jeff Marten
Colorado Springs, Co
1978 Royale
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GM used seven different carbs for the GMC motorhome.
73 and 74 years had a carb #7043254
75 and 76 and early 77 had #7045254 except for California emission carbs which were 7045554
77 coaches with the 403 engine had 17057254 and California 17057559
78 had 17058254 and California 17058559
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