Holley Carb

G

gene

New member
Sep 29, 1999
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Daren do

gene

>Has anyone had experience with a Holley carb on a GMC. My Q-Jet is BAD,
BAD,
>BAD
>and I don't even know if it really is a motorhome carb. I need to do
>something to help mileage. From my hot-rod days I know that Holley carbs
>would make small and big block Chevys scream but I have no experience with a
>Holley under a heavy load as in our GMC. Any info, pro or con, would be
>appreciated. I have HEI and headers on a strong rebuilt engine with a 3:42
>final drive.
>
>Jim Greer
>73 Canyon Lands
>South Carolina
>
Genef -- 77PB/ore/ca
GMC MOTORHOME INFORMATION
mr.erf
http://www.california.com/~eagle/
 
Jim:

Have you thought about getting it rebuilt??

I had mine rebuilt by A & G Carburetor in 1996, which is located on the West side
of Chicago in Oak Park. They told me all I had to adjust was the idle mixture and
idle speed. We mounted it back on the engine and to this day never made any
adjustments to it. I had stripped the bowl threads for the filter nut and they
replaced the bowl.

The rebuild included epoxy sealing of the bowl plugs, leather accelerator pump,
needle and seat (plus a spare needle and bowl gasket for your tool box) and
replacement of the choke pull-off. They also check the throttle plate shaft for
wear/leakage and bush it if needed.

I sent it via UPS Monday morning and had it back via UPS Friday afternoon that
same week. The carb came back so clean I called them and asked what they sprayed
on it to make it look so new. Their response was they use an eight step washing
process and nothing was sprayed on it.

Not knowing of them other than seeing their ad in the GMC Motorhome Marketplace
magazine back then, I called and talked to them 3 or 4 times, to satisfy myself
that they knew what they were doing. Each time I was more impressed than the
previous conversation. There was no BS, if you know what I mean.

They certainly should be able to tell if your card has the right components for
the Motorhome, and if not bring you up to speed.

Back then they charged $138.75 for the overhaul, $15.89 for the choke pull-off,
and $40.00 for a replacement bottom bowl.

Call them and talk to them - 708-386-9804.

Paul Bartz

From: owner-gmcmotorhome
[mailto:owner-gmcmotorhome]On Behalf Of GMC73CL
Sent: Monday, July 10, 2000 7:08 PM

Has anyone had experience with a Holley carb on a GMC. My Q-Jet is BAD, BAD,
BAD
and I don't even know if it really is a motorhome carb. I need to do
something to help mileage. From my hot-rod days I know that Holley carbs
would make small and big block Chevys scream but I have no experience with a
Holley under a heavy load as in our GMC. Any info, pro or con, would be
appreciated. I have HEI and headers on a strong rebuilt engine with a 3:42
final drive.
 
Jim,

It's tough to do for the following reasons:

- - The original manifold has several points of interference with the
linkage and float bowls. I believe you will need a 1/2 inch spacer to
make it work. I should know by next week.

- - The heat riser thermostatic vacuum switch in the back side of the air
cleaner interferes with the rear float bowl.

- - The spacer will mean raising the engine cover.

- - You'll need a new hard gas line. Must be custom bent.

- - You'll need a "Spreadbore" style carb and best to get a vacuum
secondary carb while you're at it. And if you're gonna plug the
crossovers, get the electric choke also. The Spreadbore carbs are not
the best supported Holleys and new prices are higher than the Squarebore
models.

Like Paul said, you might try a quality rebuild shop first.

Like your Qjet, mine's in sad shape and I had the opportunity to pick up
a pair of used Holley spreadbores reasonable. I'm definitely keeping
this a "reversible" change and plan to use the Holley until I decide
what to do with the Qjet. If you're really committed to using the
Holley after all the above, I may have an extra one that I'll part with
reasonable if you're interested.

Patrick

>
> Has anyone had experience with a Holley carb on a GMC. My Q-Jet is BAD, BAD,
> BAD
> and I don't even know if it really is a motorhome carb. I need to do
> something to help mileage. From my hot-rod days I know that Holley carbs
> would make small and big block Chevys scream but I have no experience with a
> Holley under a heavy load as in our GMC. Any info, pro or con, would be
> appreciated. I have HEI and headers on a strong rebuilt engine with a 3:42
> final drive.
>
> Jim Greer
> 73 Canyon Lands
> South Carolina
- --
Patrick Flowers
Mailto:patrick

The GMC Motorhome Page
http://www.gmcmotorhome.com
 
remember you might be able to sell your old Qjet for up to $400 which will
reduce the cost of the TBI-- which you will love.

gene

>Patrick,
>
>
>Thanks for your reply. That is exactly the kind of information I was
looking
>for. I am collecting data and will make some decision soon. I am also
>weighing the cost of redoing the QJet or going to a Holley against the cost
>of fuel injection. Thanks agin.
>
>Jim
>
Genef -- 77PB/ore/ca
GMC MOTORHOME INFORMATION
mr.erf
http://www.california.com/~eagle/
 
You're welcome Jim. Serendipity strikes again. I had just pulled off my
Qjet and set the Holley down in its place earlier last night before I read
your email. As with everything GMC, changes are never as easy as they look
going in.

Patrick

> -----Original Message-----
> From: GMC73CL [mailto:GMC73CL]
> Sent: Monday, July 10, 2000 10:12 PM
> To: gmcmotorhome
> Subject: Re: GMC: Holley Carb
>
>
> Patrick,
>
>
> Thanks for your reply. That is exactly the kind of
> information I was looking
> for. I am collecting data and will make some decision soon.
> I am also
> weighing the cost of redoing the QJet or going to a Holley
> against the cost
> of fuel injection. Thanks agin.
>
> Jim
>
 
I have a Holley 750cfm Double Pumper with electric choke. Wouldn't have anything
else. Great performance, one screw adjustment and looks good too. I had to redo
the linkage but that was no big deal. no nest of vacuum hoses either. Only one to
the carb. As far as performance goes, I can't give a real time version yet as I
have not driven it at full weight yet. Drove to Albuquerque and back, 3000 mi.,
and got 12 mpg but I was also about 2000 lbs shy on weight. Darren

> Has anyone had experience with a Holley carb on a GMC. My Q-Jet is BAD, BAD,
> BAD
> and I don't even know if it really is a motorhome carb. I need to do
> something to help mileage. From my hot-rod days I know that Holley carbs
> would make small and big block Chevys scream but I have no experience with a
> Holley under a heavy load as in our GMC. Any info, pro or con, would be
> appreciated. I have HEI and headers on a strong rebuilt engine with a 3:42
> final drive.
>
> Jim Greer
> 73 Canyon Lands
> South Carolina

- --
Darren Paget
76 Experimental
Another Fab Day
http://www.TZEplus.com
 
Jim,

I have a Holley 4165 carb on my coach. PO put it there. It seems to do the job.
It is 650 cfm and most of the old guard seem to think that the extra 100 cfm on a
750 is not necessary as the coach doesnt rev that high. I have been getting
between 8.9 and 9.4 MPG partially loaded without having touched the thing. Runs
rough hot but I think that is due to fuel line heating (gas line insulation is in
my future). I have the Holley book and would be happy to look up anything you
need, including figuring out which one is best (though I am in no way an expert!)

RON

> Has anyone had experience with a Holley carb on a GMC. My Q-Jet is BAD, BAD,
> BAD
> and I don't even know if it really is a motorhome carb. I need to do
> something to help mileage. From my hot-rod days I know that Holley carbs
> would make small and big block Chevys scream but I have no experience with a
> Holley under a heavy load as in our GMC. Any info, pro or con, would be
> appreciated. I have HEI and headers on a strong rebuilt engine with a 3:42
> final drive.
>
> Jim Greer
> 73 Canyon Lands
> South Carolina
 
I have posted this before, but this is the type of carb we put on our coach.
Has worked well so far...

http://www.jetchip.com/fuel/carbs.cfm

Once again, as I have said before, I am an expert on very little (nothing if
you ask my wife), but this was a recommendation made to me by someone who IS
an local expert, and has worked well for me.

Tony Bad

- ----- Original Message -----
From:
To:
Sent: Tuesday, July 11, 2000 12:04 PM
Subject: Re: GMC: Holley Carb

>

>
> >
>
> Ron,
>
> Thanks for the reply. This is more grist for the mill. This net is a
> marvel; so much good info in such a short time. I'm about ready to do an
> "Arch type analysis" and decide what to do with my carb situation. Thanks
> again.
>
> Jim
>
 
A few notes on Holley Carbs. AFAIK, the "spreadbore"(venturi arrangement
similar to Qjet) comes in two flavors - Mod. 4165 and 4175. Mod. 4165 is a
mechanical secondary, double accelerator pump design. Mod. 4175 is a vacuum
secondary, single accelerator pump design. Both are rated at 650cfm. In
addition to model number, the individual applications are determined by
"List" number stamped on the front of the air horn.

On the stock or Edelbrock "Performer" manifold, you must either use a
spreadbore carb or a plate(usually about an inch thick) to adapt a
squarebore carb to the spreadbore pattern. Offenhauser makes a squarebore
manifold to fit the 455 - not sure if anyone else does(Mondello would be a
good place to check this).

Patrick
 
Ron,

Is it mounted on the factory manifold?

Patrick

>
> I have a Holley 4165 carb on my coach. PO put it there. It
> seems to do the job.
 
I believe it is. I wouldn't be surprised if it wasnt. Guy I bought it
from was a 70's car buff and he told me about some strange repowering he
has done over the years (was that Chevette or Corvette engine in his
Camaro?)
.
Based on the stamped code on the installed on my coach is a:

0-6497 (4165) Direct street replacement for 70-72 455 CID engines except
Toronado. Mechanical secondaries, spreadbore, double pump, 650 c.f.m.,
emission carb, integral choke (electric).

I have the book if anyone wants me to look something up. I have the
book because I love to read. It makes up for my mechanical inadequacies
enough to know when to call in a mechanic.

Ron and Julie

> Ron,
>
> Is it mounted on the factory manifold?
>
> Patrick
>

> >
> > I have a Holley 4165 carb on my coach. PO put it there. It
> > seems to do the job.
 
Ron,

Interesting that the application excludes Toro's. The biggest problem that
I've run into on mine is that the manifold interferes with the throttle
linkage because the carb mount is "sunken" into the manifold. I wonder if
your P.O. used a spacer or modified the linkage?

Could you post or email me a photo of that side of the carb?

Patrick

>
> I believe it is. I wouldn't be surprised if it wasnt. Guy I
> bought it from was a 70's car buff and he told me about some
> strange repowering he has done over the years (was that
> Chevette or Corvette engine in his Camaro?)
> .
> Based on the stamped code on the installed on my coach is a:
>
> 0-6497 (4165) Direct street replacement for 70-72 455 CID
> engines except Toronado. Mechanical secondaries, spreadbore,
> double pump, 650 c.f.m., emission carb, integral choke (electric).
 
Patrick,

I ripped up my back on Saturday lifting the tongue of the $100 5x9 trailer I
got to pull behind the GMC or Tracker (I hope the Suburban sells soon!) I am
propped up in front of the computer icing my back. Hurts like hell.

My buddy from work is coming here after work to charge my A/C (both roof and
dash) Both work but I want to make sure that they are blowing their coldest.
I will have him pull the cover and I will take a look. I dont have a digital
camera yet. I hope to have one prior to our Colorado trip.

Biggest problem is that I am supposed to take the coach to Ken Frey on
Thursday. If my back hurts this much, it ain't going to happen. The only
thing that would be more painful than driving for 6 or 7 hours round trip would
be being a passenger while Julie drove 6 or 7 hours! My heart is strong but
not that strong.

Ron and Julie

> Ron,
>
> Interesting that the application excludes Toro's. The biggest problem that
> I've run into on mine is that the manifold interferes with the throttle
> linkage because the carb mount is "sunken" into the manifold. I wonder if
> your P.O. used a spacer or modified the linkage?
>
> Could you post or email me a photo of that side of the carb?
>
> Patrick
>

> >
> > I believe it is. I wouldn't be surprised if it wasnt. Guy I
> > bought it from was a 70's car buff and he told me about some
> > strange repowering he has done over the years (was that
> > Chevette or Corvette engine in his Camaro?)
> > .
> > Based on the stamped code on the installed on my coach is a:
> >
> > 0-6497 (4165) Direct street replacement for 70-72 455 CID
> > engines except Toronado. Mechanical secondaries, spreadbore,
> > double pump, 650 c.f.m., emission carb, integral choke (electric).
 
I will check my part number on my Holley but I didn't need an adapter plate for
the Edelbrock Performer manifold I am running. Need to check through about 1500
receipts but I will get back. Darren

> A few notes on Holley Carbs. AFAIK, the "spreadbore"(venturi arrangement
> similar to Qjet) comes in two flavors - Mod. 4165 and 4175. Mod. 4165 is a
> mechanical secondary, double accelerator pump design. Mod. 4175 is a vacuum
> secondary, single accelerator pump design. Both are rated at 650cfm. In
> addition to model number, the individual applications are determined by
> "List" number stamped on the front of the air horn.
>
> On the stock or Edelbrock "Performer" manifold, you must either use a
> spreadbore carb or a plate(usually about an inch thick) to adapt a
> squarebore carb to the spreadbore pattern. Offenhauser makes a squarebore
> manifold to fit the 455 - not sure if anyone else does(Mondello would be a
> good place to check this).
>
> Patrick

- --
Darren Paget
76 Experimental
Another Fab Day
http://www.TZEplus.com
 
Darren,

Don't bother with the 1500 receipts, just pull the air cleaner off and read
the model and list numbers off the air horn. If it's a spreadbore carb, you
don't need an adapter for the Performer manifold.

Patrick

>
> I will check my part number on my Holley but I didn't need an
> adapter plate for the Edelbrock Performer manifold I am
> running. Need to check through about 1500 receipts but I will
> get back. Darren
 
>
> I ripped up my back on Saturday lifting the tongue of the
> $100 5x9 trailer I got to pull behind the GMC or Tracker
> (I hope the Suburban sells soon!) I am propped up in
> front of the computer icing my back. Hurts like hell.

Ouch! I feel your pain brother. My right rotator cuff has been giving me
trouble occasionally for the past two years, but it's been quiet lately.
After moving batteries around all day Saturday, I feel like someone took a
2x4 to my shoulder. Altho' from my own past experience with back problems,
I'd rather have my shoulder than your back.

Patrick
 
The biggest problem is the 6 pages of stuff I wanted to do to the coach before
Colorado. I knew I could only get 3 pages done but one might be a stretch now!

Ron

> >
> > I ripped up my back on Saturday lifting the tongue of the
> > $100 5x9 trailer I got to pull behind the GMC or Tracker
> > (I hope the Suburban sells soon!) I am propped up in
> > front of the computer icing my back. Hurts like hell.
>
> Ouch! I feel your pain brother. My right rotator cuff has been giving me
> trouble occasionally for the past two years, but it's been quiet lately.
> After moving batteries around all day Saturday, I feel like someone took a
> 2x4 to my shoulder. Altho' from my own past experience with back problems,
> I'd rather have my shoulder than your back.
>
> Patrick
 
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