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Necoa #: 1875
Location: 3(DE,NJ,PA)
Joined: Nov 29, 2003
Posts: 467
Year: 1980
Model: El Camino
Posted: Sun Jul 06, 2008 9:58 pm Post subject: Edelbrock or Holly?
How's everybody doing? If money wasn't an issue and you had a pretty strong 355 and trany, which would be the better choice,,,,, Edelbrock 600 or Holly 670? _________________ Douglas
1980 El Camino
1996 Chevy Blazer
1982 Camaro
1982 Fiat Spider 2000
My Gallery
It will depend on what you expect from the engine.
If you plan to race it, the Holley Street Avenger (670) is easier to change jets and tweak at the track. Making it infinitely more adjustable.
If all you want is a high power street machine, the Edelbrock Performer (600) is more Plug-and-Play. Set it and forget it. You can change jets and springs, but the carb has to be virtually disassembled. Not ideal for quick changes. _________________
1981 Chevy El Camino
1991 Chevy S10
"The only thing collecting dust in my garage... is my broom"
Of course this is a discussion that's been done to death, but I'll add my .02. I had a 600 Eddy on my 355 and just recently replaced it with a Holley Street Avenger 670, and man, what a difference. Night and day. Love that Holley. But it did take quite a bit of tweaking to get it dialed in to my motor. _________________ Mark
1972 Elky Picture Album
Necoa #: 1875
Location: 3(DE,NJ,PA)
Joined: Nov 29, 2003
Posts: 467
Year: 1980
Model: El Camino
Posted: Mon Jul 07, 2008 1:50 am Post subject:
I'm sorry if it's been done to death. I don't have a whole lot of time to check the forums.
I also don't know much about tweaking carbs. I guess I know enuff to be dangerous. I can probably pick stuff up pretty quick tho. Maybe I'll get the Holly and see how it goes.
thanx,,,,,,,,dug _________________ Douglas
1980 El Camino
1996 Chevy Blazer
1982 Camaro
1982 Fiat Spider 2000
My Gallery
Hey Doug, Don't take offence to me saying it's been done to death. The old Holley vs Edelbrock argument is like Chevy vs Ford or Apple vs Blueberry pie. Wasn't implying anything more than that. _________________ Mark
1972 Elky Picture Album
Necoa #: 1875
Location: 3(DE,NJ,PA)
Joined: Nov 29, 2003
Posts: 467
Year: 1980
Model: El Camino
Posted: Mon Jul 07, 2008 4:49 pm Post subject:
No offense taken bud. So if I DID get the Holly, would I be buying a couple jets and parts to be changing out to get it working right, or is it more like the plug-n-play edelbrock? _________________ Douglas
1980 El Camino
1996 Chevy Blazer
1982 Camaro
1982 Fiat Spider 2000
My Gallery
Necoa #: 7195
Location: 17(S.CA,S.NV)
Joined: Mar 26, 2006
Posts: 791
Year: 1977
Model: El Camino
Posted: Mon Jul 07, 2008 6:21 pm Post subject:
I've had them both on my 454, (larger cfm though) and I now have a Berry Grant Demon on it, and love it. The response is outrageiously better than the Holley or Eddi. It is also a plug & play, but a tad bit more $$. See the 650 below, just another opption to consider.
http://www.jegs.com/i/Barry+Grant/132/1282010VE/10002/-1/743583%7C10271
PS. And should you want to play with differant jet sizes, it uses the Holly Jets, In fact it is almost the same Carb but more advanced. _________________ http://elcaminocentral.com/gallery-album_CoyoteOn2s77Cage.html
Keep the Shiney Side Up
The Rubber Side Down !!
aka Larry
between the edelbrock and the holley, i prefer the edelbrock for all around use. having had both i can say that both have their strong and weak points. the edelbrock is more street friendly, and usually has better street manners than the holley does, but it is hard to beat the holley throttle response. the holley is easier to tune, but you can get the edelbrocks fuel curve closer to what the engine wants. one thing i dont like about the holley is that it runs fuel through a gasketed area which is an invitation for leaks. i also dont like the power valve system either. in my opinion the edelbrock has a better system, though it also has issues also. the edelbrock on my elco is just about perfect out of the box, though i may get into it and see if i can lean it out a bit for some better fuel economy. _________________ 64 falcon
66 mustang
76 el camino
a mans fate is a mans fate
and life is but an illusion
Necoa #: 10934
Location: 15(AZ,NM)
Joined: Feb 03, 2008
Posts: 441
Year: 1981
Model: El Camino
Posted: Tue Jul 08, 2008 3:45 pm Post subject:
Well, if you have the money. I would suggest one of Holley's HP street series. Either the 650 or 750 mechanical secondaries. i know a lot of people will say I'm nuts. But these things rock.
Necoa #: 1875
Location: 3(DE,NJ,PA)
Joined: Nov 29, 2003
Posts: 467
Year: 1980
Model: El Camino
Posted: Fri Jul 18, 2008 5:10 pm Post subject:
OMG I've been so excited the last couple days I forgot to post. I bought this Holly 600 off of by buddy for $80, brand new still in the box. The same guy that sold me the bad rear end engine, and it WOKE the monster within!!!
WOW was I surprised!! After the first ride up and down the street my hands were actually shaking!!! HE he HE
YEEE HAAAA _________________ Douglas
1980 El Camino
1996 Chevy Blazer
1982 Camaro
1982 Fiat Spider 2000
My Gallery
Necoa #: 5673
Location: 2(CT,MA,ME,NH,RI,VT)
Joined: Jun 26, 2005
Posts: 850
Year: 1970
Model: El Camino
Posted: Thu Jul 24, 2008 7:02 pm Post subject:
Glad you're happy and glad you got such increased performance for just $80. You done good by almost any masurement.
Now, Let me add a twist regarding air fuel ratio. Ideal air/fuel ratio (chemically speaking) is 14.7:1 That is, 1 pound of gasoline mixed with 14.7 pounds of air. For maximum performance, the ratio is more like 12.5:1, give or take a little.
You may see where I'm going....
The jump in performance you just experienced by going with the Holley 600, may be due more to a change in air/fuel ratio than of carb design. Or, it could be because the Edelbrock you removed may have had something wrong with it.
Either way, for $80, I'm glad you're happy with the result. Just be a little watchful that your new carb isn't burning excessive fuel.
With a little tweaking, they can be tuned to get 14.7:1 on the highway when you want economy, and 12.5 when you stick your foot in it adn want performance.
As for me? I run Holleys on both my 454 playtoys. Great performance, but then I only get 10-12 MPG, (like you now)!!
Happy fueling!!! _________________ 70 Elky (Non-SS) 454CID, TH700-R4
69 Chev C-10 Pickup (recently Upgraded to 454) w/TH400
29 Model A (Recently Sold).
Necoa #: 1875
Location: 3(DE,NJ,PA)
Joined: Nov 29, 2003
Posts: 467
Year: 1980
Model: El Camino
Posted: Fri Jul 25, 2008 10:33 am Post subject:
Fuel mileage??? That went out the window when I built this monster!
Yea I think it is both the increase in air/fuel and something wrong with the edelbrock. When I would put my hand over the carb on the edel, it would slowly die, but when I put my hand over the holly it sucked it down onto the carb so hard it scared me. LOL
How do you go about adjusting air/fuel? And how do you know what ratio you got? _________________ Douglas
1980 El Camino
1996 Chevy Blazer
1982 Camaro
1982 Fiat Spider 2000
My Gallery
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between the edelbrock and the holley, i prefer the edelbrock for all around use. having had both i can say that both have their strong and weak points. the edelbrock is more street friendly, and usually has better street manners than the holley does, but it is hard to beat the holley throttle response. the holley is easier to tune, but you can get the edelbrocks fuel curve closer to what the engine wants. one thing i dont like about the holley is that it runs fuel through a gasketed area which is an invitation for leaks. i also dont like the power valve system either. in my opinion the edelbrock has a better system, though it also has issues also. the edelbrock on my elco is just about perfect out of the box, though i may get into it and see if i can lean it out a bit for some better fuel economy.
