Home » Public Forums » GMCnet » Has anyone ever run an Edelbrock 2151 mani, and non stock carb (IE Holley) setup?
| Has anyone ever run an Edelbrock 2151 mani, and non stock carb (IE Holley) setup? [message #59528] |
Fri, 09 October 2009 11:13  |
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I have a like new 2151 mani and holley 670 CFM carb, and I would love to install it on the Coach, the old carb is tired and secondaries do not function. I know I will have to build a new Engine compartment lid for the increased height of the carb and mani setup. but was wondering if anyone else had done such a modification?
73 Canyon Lands, (a.k.a. The Yellow Submarine) West Los Angeles CA
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| Re: [GMCnet] Has anyone ever run an Edelbrock 2151 mani, and non stock carb (IE Holley) setup? [message #59533 is a reply to message #59528] |
Fri, 09 October 2009 11:51  |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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You must realize that this is a motorhome and not a car.
Torque is the key,if you do not understand about power valves, your
mileage will not be Worth discussing.
I have played with Holly carbs in my younger days,
On Fri, Oct 9, 2009 at 9:13 AM, Shan Rose <defconfx@gmail.com> wrote:
>
>
> I have a like new 2151 mani and holley 670 CFM carb, and I would love to install it on the Coach, the old carb is tired and secondaries do not function. I know I will have to build a new Engine compartment lid for the increased height of the carb and mani setup. but was wondering if anyone else had done such a modification?
>
>
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Jim Kanomata
Applied/GMC, Fremont,CA
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www.appliedgmc.com
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| Re: [GMCnet] Has anyone ever run an Edelbrock 2151 mani, and non stock carb (IE Holley) setup? [message #59640 is a reply to message #59528] |
Sat, 10 October 2009 15:55 |
Tin Gerbil
Messages: 236
Registered: October 2006
Location: Vancouver Island, B.C.
Karma: 0
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Senior Member |
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I had the Edelbrock Al manifold and Holley Carb on my other GMC. It had
a cover just over the aircleaner. A better system I have seen is a 2"
raised section of the engine lid going from front to rear. It is @ 6"
wide at the top and the two sides slope at a 45* angle to the original
lid. A Jeep air cleaner elbow fits on top of the carb, but make sure it
does not restrict the volume of air. This seems a much better idea that
to raise the entire lid.
Gordon
Shan Rose wrote:
>
> I have a like new 2151 mani and holley 670 CFM carb, and I would love
> to install it on the Coach, the old carb is tired and secondaries do
> not function. I know I will have to build a new Engine compartment
> lid for the increased height of the carb and mani setup. but was
> wondering if anyone else had done such a modification?
>
>
> _______________________________________________ GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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Gordon
'74 Canyon Lands "Tin Gerbil"
Vancouver Island, B.C.
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| Re: Has anyone ever run an Edelbrock 2151 mani, and non stock carb (IE Holley) setup? [message #59652 is a reply to message #59528] |
Sat, 10 October 2009 18:14 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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Qjets are so easy to fix it would be way easier than raising the floor and always tripping and twisting your ankles. The small primaries on the Qjet are your torquey and fuel mileage friends. You probably just need a secondary vac pull off and a cleaning and adjustment to undo all the years of other people's tinkering by those that may not understand the Qjet. That's my opinion.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: Has anyone ever run an Edelbrock 2151 mani, and non stock carb (IE Holley) setup? [message #59865 is a reply to message #59802] |
Mon, 12 October 2009 10:59 |
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ok, now im a little jealous, I want a caddy 500 motor 
but back to topic, I have this remanufactured Holley performer, and eddy mani, I would love to use them, especially since the old QJ has been giving me problems and the float has been sticking. was thinking of getting adjustable metering blocks for the Holley which allow for rejetting with a twist of a screw so you can set secondaries independant of primaries and so on.
I had planed to make a beveled deck area and raise the hatch 3-4 inches it would look like it was stock and add a CAI while I'm at it.
I just wanted to hear any experiences anyone else had who ran this setup. I know performance gains will probably be minimal at best, the only real way to boost performance in a noticable level is to drop in a massive moter like the Caddy and stroke/boost it
73 Canyon Lands, (a.k.a. The Yellow Submarine) West Los Angeles CA
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| Re: [GMCnet] Has anyone ever run an Edelbrock 2151 mani, and non stock carb (IE Holley) setup? [message #59893 is a reply to message #59869] |
Mon, 12 October 2009 16:47 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Gene,
Two comments:
The Blue Streak has the Edelbrock manifold, Holley Commander 950 four barrel
TBI injection, MSD distributor and it goes WAY better than Double Trouble
even with the Paterson Quadrajet and re-curved distributor.
You can also "drop in" an 8.1 like Dave Lenzi did!
He let me drive it when I Helen and I stopped by to visit on our recent
tour. You barely touch the accelerator and it's GONE!
Aussie lesson for the day: "It goes like a shower of shit!"
Regards,
Rob Mueller
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
'75 Avion - USA - The Parts Coach TZE 365V100324
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Mr.erf ERFisher
Sent: Tuesday, October 13, 2009 3:24 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Has anyone ever run an Edelbrock 2151 mani,and non
stock carb (IE Holley) setup?
Mondello does not think it is massive
http://www.jpmagazine.com/projectbuild/154_0710_project_murderous_overkill_4
55/cam_valvetrain.html
the only real way to boost performance in a noticable level is to drop in a
massive moter like the Caddy and stroke/boost it :)
gene
--
Gene Fisher -- 74-23,77PB/ore/ca
"Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Has anyone ever run an Edelbrock 2151 mani, and non stock carb (IE Holley) setup? [message #59897 is a reply to message #59893] |
Mon, 12 October 2009 17:42 |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
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Senior Member |
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I always ask Manny why he does this, or that, and he has a great answer
"because I can".
However this is not always the answer for the rank and file who just want to
drive and drive and drive.
I always ask why the old big time racers like , Mondello, Patterson, Koba,
specialize in the 455 ?
There are lots of reasons, but it does not matter. We all own a 455 / 403
and they do a good job in our application.
The other engines (including diesels) have been used in many GMCs but there
has not been a compelling advantage to make the average GMCer want to change
engines. Even Western Dyno, who specialized in conversions to 454 and 8.1
were not successful ( in fact some of those engines have been replaced)
So if you want to put in a Cad, an 8.1 , propane, etc, "because you can" I
think that is a great idea, and I love to participate.
But
I have not seen a cost-effective reason for the average guy to lust after
one of these "custom" engines and I think it is not possible to say "this is
the answer."
After all, you still will get 8 to 10 miles per gallon depending upon if
your tow ;>)
JWID
gene
--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
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| Re: Has anyone ever run an Edelbrock 2151 mani, and non stock carb (IE Holley) setup? [message #59963 is a reply to message #59528] |
Tue, 13 October 2009 10:30 |
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well if I had an unlimited budget, a real fun project would be to stuff in one of world castings 632 Merlin motors! with 10.3 liters of displacement in a 454 sized package and a whopping 4.75 stroke! this could be a platform for insane amounts of torque. but its an expensive toy to play with.
The vortech 8.1 does sound interesting though, however it would probably just be easier to drop on a set of edelbrock heads with the mani as that would probably give some better overall performance.
73 Canyon Lands, (a.k.a. The Yellow Submarine) West Los Angeles CA
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| Re: Has anyone ever run an Edelbrock 2151 mani, and non stock carb (IE Holley) setup? [message #60005 is a reply to message #59528] |
Tue, 13 October 2009 17:47 |
Gail Marks Cruiser
Messages: 125
Registered: August 2009
Location: Gold Coast, Australia
Karma: 0
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Senior Member |
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G'day,
I run a 2151 manifold, my thinking that with exhaust block-off plates it would help cool the carby, (getting it out of the valley)it did cut down the carby boiling and improve pick-up. I already had a raised engine cover, another long story, so that wasn't an issue. I bought an old ford Clevland air filter, for the large filter area, and cut down the base so it fits lower over the carby.My next task is to run ducting to the front to pick-up cooler air and reduce the intake noise.
I planned to run a holly carb as I have tuned so many of them I could probably rebuild one in my sleep. But research on various web sites and talking to professional tunners that sticking with the Q-jet was the way to go. The main reason is I kept thinking WOT, where as in a GMC economical cruise is the target and you would be hard pushed to beat the small, resonably tuneable primaries of a Q-jet. My original carb was off a pollution 403, getting the right model carb made a big difference to economy and drivability.
What I would realy like is a manual (stick) gearbox, I reckon that could be good for up to 2 MPG and eliminate any cooling issues. I hate to think of the enginering to accomplish that!
Mark Bennett
Gail & Mark's Cruiser
Gold Coast, Australia.
Motorhoming Lifestyle.com
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| Re: [GMCnet] Has anyone ever run an Edelbrock 2151 mani, and non stock carb (IE Holley) setup? [message #60016 is a reply to message #60005] |
Tue, 13 October 2009 19:41 |
Tin Gerbil
Messages: 236
Registered: October 2006
Location: Vancouver Island, B.C.
Karma: 0
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Senior Member |
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Mark;
I fail to see what is wrong with Holly carbs. GM put them on all BB
heavy trucks in the 60's and 70's. I never had a problem with them from
366, 427 or 454's. Clean the body, change the needle and seat, set the
fuel level in the bowl and go. A GMC is just a truck with a bed and
clanger.
Gordon
Mark Bennett wrote:
>
> G'day, I run a 2151 manifold, my thinking that with exhaust block-off
> plates it would help cool the carby, (getting it out of the valley)it
> did cut down the carby boiling and improve pick-up. I already had a
> raised engine cover, another long story, so that wasn't an issue. I
> bought an old ford Clevland air filter, for the large filter area,
> and cut down the base so it fits lower over the carby.My next task is
> to run ducting to the front to pick-up cooler air and reduce the
> intake noise.
>
> I planned to run a holly carb as I have tuned so many of them I could
> probably rebuild one in my sleep. But research on various web sites
> and talking to professional tunners that sticking with the Q-jet was
> the way to go. The main reason is I kept thinking WOT, where as in a
> GMC economical cruise is the target and you would be hard pushed to
> beat the small, resonably tuneable primaries of a Q-jet. My original
> carb was off a pollution 403, getting the right model carb made a big
> difference to economy and drivability.
>
> What I would realy like is a manual (stick) gearbox, I reckon that
> could be good for up to 2 MPG and eliminate any cooling issues. I
> hate to think of the enginering to accomplish that!
_______________________________________________
GMCnet mailing list
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Gordon
'74 Canyon Lands "Tin Gerbil"
Vancouver Island, B.C.
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| Re: Has anyone ever run an Edelbrock 2151 mani, and non stock carb (IE Holley) setup? [message #60018 is a reply to message #59528] |
Tue, 13 October 2009 20:17 |
Gail Marks Cruiser
Messages: 125
Registered: August 2009
Location: Gold Coast, Australia
Karma: 0
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Senior Member |
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Gordon,
Please don't get me wrong, Hollies have always been my carby of choice, with their interchange ability off parts it is possible to make a carb for any application. The other big plus for Hollies is once your in the ballpark as far as tune, you don't have to break a gasket for fine tuning e.g. accelerator pumps and cams.
My thinking is that GM by passed Holley for the GMC and had a Q-jet made to suit, especialy with it's one off jetting. With all the money GM threw at the GMC I feel that how it came is a good starting point, then if I can fault it I will change it. That is why I ripped out all the "house" wiring and started again.
I was glad to be rid of the heavy cast iron manifold as the last thing you need here in OZ is carby heat. Besides when I took the old manifold off it had a 4" crack under it, that someone tried to patch with muffler putty!
Mark Bennett
Gail & Mark's Cruiser
Gold Coast, Australia.
Motorhoming Lifestyle.com
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| Re: Has anyone ever run an Edelbrock 2151 mani, and non stock carb (IE Holley) setup? [message #60039 is a reply to message #59865] |
Tue, 13 October 2009 23:40 |
jhb1
Messages: 303
Registered: February 2004
Karma: 0
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Senior Member |
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Hi
I am running this manifold with an old AirSensor MAF injection setup with JimB's cam and 10.5-1 pistons other than having to fill with hi-test it is working great I have put about 15,000 miles on this setup without any problems. Have been from Montreal,Qc. to Orlando then L.A. and back in 2007 and averaged 10.54 MPG for the whole trip. The only down side is I still trip over the raised portion of the hatch.
Hope this helps
[/quote]
ok, now im a little jealous, I want a caddy 500 motor
but back to topic, I have this remanufactured Holley performer, and eddy mani, I would love to use them, especially since the old QJ has been giving me problems and the float has been sticking. was thinking of getting adjustable metering blocks for the Holley which allow for rejetting with a twist of a screw so you can set secondaries independant of primaries and so on.
I had planed to make a beveled deck area and raise the hatch 3-4 inches it would look like it was stock and add a CAI while I'm at it.
I just wanted to hear any experiences anyone else had who ran this setup. I know performance gains will probably be minimal at best, the only real way to boost performance in a noticable level is to drop in a massive moter like the Caddy and stroke/boost it
[/quote]
John H. Bell
77 Royale; QuadBag,Manny OneTon,Honda EV4010, FITech
Montreal Qc.
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| Re: [GMCnet] Has anyone ever run an Edelbrock 2151 mani, and non stock carb (IE Holley) setup? [message #60045 is a reply to message #60039] |
Wed, 14 October 2009 01:09 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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John,
This is very good information for me! I have all the parts to build a Caddy
500 sitting in my storage facility in Houston that I will build and ship to
Australia for The Blue Streak. It has been set up to run on LPG but since it
has 10-1 pistons in it I was worried about breaking it in (or is it braking)
on petrol first. If you don't have knock problems with your 455 running
10.5-1 on hi-test I'll probably be OK with the Caddy at 10-1!
Regards,
Rob Mueller
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
'75 Avion - USA - The Parts Coach TZE 365V100324
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of jhb1
Sent: Wednesday, October 14, 2009 3:41 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Has anyone ever run an Edelbrock 2151 mani,and non
stock carb (IE Holley) setup?
Hi
I am running this manifold with an old AirSensor MAF injection setup with
JimB's cam and 10.5-1 pistons other than having to fill with hi-test it is
working great I have put about 15,000 miles on this setup without any
problems. Have been from Montreal,Qc. to Orlando then L.A. and back in 2007
and averaged 10.54 MPG for the whole trip. The only down side is I still
trip over the raised portion of the hatch.
Hope this helps
[/quote]
ok, now im a little jealous, I want a caddy 500 motor :)
but back to topic, I have this remanufactured Holley performer, and eddy
mani, I would love to use them, especially since the old QJ has been giving
me problems and the float has been sticking. was thinking of getting
adjustable metering blocks for the Holley which allow for rejetting with a
twist of a screw so you can set secondaries independant of primaries and so
on.
I had planed to make a beveled deck area and raise the hatch 3-4 inches it
would look like it was stock and add a CAI while I'm at it.
I just wanted to hear any experiences anyone else had who ran this setup. I
know performance gains will probably be minimal at best, the only real way
to boost performance in a noticable level is to drop in a massive moter like
the Caddy and stroke/boost it :)
[/quote]
--
John H. Bell
77 Royale
Montreal Qc.
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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