Thanks Ted. If I plan on a mid range build for the 272 and a upper end range build for the 292, would you recommend 500 for the 272 and a 600 for the 292? I really like the idea of the Edelbrock becasue If I understand correctly, they are easier to tune and adjust than other options.Since I already have the 500 Thunder, Im thinking I should use it on the 272 and order a 600 for the 292? Not sure about the 600 based on your experience and the "flat spot". Wonder if a 500 or 700 would work for a hopped up 292.

I just called Edelbrock Tech. They recommend the 500 for anything below 300ci. The 272 won't be an issue. The 292 could be with a little modification. I think Im going to put the 500 on the 272 and order something bigger for the 292. Is should not take much modification to get the 292 above 300. 

Darrell Howard Whitefish, MT Outlaw 56 Ford F-100's

The Edelbrock 600 worked fine on my warm 292, other than that air valve problem, which you probably won't have.  Since you mentioned Thunder, I assume you mean the Thunder AVS, you absolutely should not have that problem because it is adjustable.
That said, if Edelbrock recommended the 500, that may be the one to go with.  Did you tell them your plans or just that it is 292ci?
Another thought is since you will already have a 500, you can try it on the 292 and see if you like it.  If you are satisfied with the performance then get another 500.



Lawrenceville, GA

Hey Charlie, I did tell Edelbrock Tech I would eventually want a medium build on the 272. They said anything below 300 would be fine with the 500 Thunder AVS I already have. I assumed anything above 300 would get the 600. Ted said he had experienced a flat spot on the the Edelbrock 600 he borrowed from a friend to test on his 272. My 272 will be the first truck I have running, so as long as I already have the 500, Im thinking I will try it on the 272. When it comes time to get another carb for my 292, I will maybe bump up to a 600 or 700. My other concern is in the 292, I have installed an AOD. I dont think the 500 Thunder AVS I have now is set up for the AOD Cable. Really not sure how all that works, but next carb I buy I will know more about what I need for the AOD cable hook up. If I understand correctly, some carburators come with the option of a throttle cable connect for an AOD and some dont?

Darrell Howard Whitefish, MT Outlaw 56 Ford F-100's

What I mean is when it comes time to get a carb for the 292, you can use the 500 off of the 272 to see how it does.  That way it takes some guessing out and you can decide on a 500 or 600 for the 292 more easily.
Regarding the throttle linkage, they offer conversion kits for various transmissions so they probably have something that will work for the AOD.



Lawrenceville, GA

ok, got you this time. Makes sense, lol. Geze how did I miss that the first time. Thanks Charlie!

Darrell Howard Whitefish, MT Outlaw 56 Ford F-100's

Charlie, 
          I have zero experience with the 570. Are the primaries smaller on it than a comparable Edelbrock 1405 ?. That could explain the better response  at lower rpm's with a small inch motor. That was always the hard part of trying to make a 600 anything work o a 272 or under 300 inch anything. I also don't have any experience with the Edelbrock 500 on anything. I can only relate to the 312-600 combo, and we know that works pretty well. c
           I suspect that a lot of our "opinions" on this subject arise from one example (like mine) and really aren't worth much on another combination. Example, My 65 GTO came with a Carter AFB. Same carb as the Edelbrock of today. As soon as I modified the car it became undriveable. swapped a 750 Holley on it and it was all better. Therefore I don't like AFB's / Edelbrocks. Well i was wrong!
  On the street at least they are very good. I had some bad luck with Holley 10-15 years ago and became set against them. They've cleaned up their act and now are very good again. Careful about  opinions!!

Outlaw: Check Lokar's cable setup for the AOD. It works very well, had one on my 408 Ranger P/U.  

Frank/Rebop

Bristol, In ( by Elkhart) 

My problem is lack of experience. I get on these forums where there are so many members who know so much more than I do and have so much more hands on experience. Without the input of the forum, I would be so so lost. My decision to go with the Edelbrock Performer or Thunder 500 on my 272 was based on several facts. First, I already had a new in the box Edelbrock 500 Thunder AVS that I had previously choosen for my 292 with a future build. Probably 300 or above. Then I came across another truck and drug it home. That has a 272 so I was faced with the same option again. It had the two barrell intake and a dizzy. I swapped them out for a B manifold and post 57 Distributer. Not realizing at the time  the trend seems to be "over carbing" these engines. 

After considerable more research and forum input, I have to face this decision again. Edelbrock out of the box is a good choice for me because I dont have to remove it to make adjustments and they seem much easier for a beginner like myself. I would like to try something else, but am not wanting to put the patience into learning carberation from ground zero. That left me with the opportunity to consider another carb for the 292 and use the 500 Thunder for my 272. Had I known before what I know now, I may have chosen the Performer over the Thunder, but I dont think I can get hurt because they are the same with exception the Thunder has more adjustment options. 

During this process, I also came across some information that talked about some carbs not working with an AOD becasue they do not have the auto transmission shift cable that hooks to the carb. When I bought my Edelbrock Thunder, I did not pay any attention to whether or not it was set up for AOD. Its quite possible I can get it as an add on, but since Im wanting to get the 292 above 300, it would be a good time to consider a 600/700 with the AOD Cable set up. I have to figure out exactly what Im going to do with the 292 before I select a 600 or 700. I certainly have the option to throw my 500 on it and take it for a test drive before I make another choice. By then, I may even go with a  holley? Right now, Im looking at that new black powdercoated Edelbrock.

I would be in big trouble if it were not for all the input I get from this forum.
 




Darrell Howard Whitefish, MT Outlaw 56 Ford F-100's

Frank,
I don't know how the primaries compare between the two carbs.  However, one thing I do recall is that the 500 and 600 cfm Edelbrocks have the same primary and secondary bores and venturi diameters, as indicated in the tuning manual.  So there's more to it than those specs alone.

In my experience, the better response was throughout the entire range, not just low rpm, only verifiable by my butt, though.  Another problem I had with the Edelbrock is during hard cornering, the truck would sputter and sometimes stall.  I never changed the float level from the factory setting.  That could have fixed that problem but the floats were set to the by-the-book spec.  And how hard was I really cornering in a 50 year old truck with horse and buggy suspension?  I couldn't imagine that on a vehicle that actually handles.  I'll definitely try it again on some engine in the future since I have it and I know a lot of people have success with them and I believe in second chances but as my first experience with an Edelbrock, I'm not impressed.

The tuning manual that comes with the Edelbrock is phenomenal.  Most of the information can be applied, in general, to any carburetor, so from that perspective, it absolutely is a great carburetor if tuning is new to you.  It tells you specifically how to tune the Edelbrock and from that experience, you have an analog for tuning most others.



Lawrenceville, GA

Im taking notes....when I bolt up my 500 to my 272 you can be I will be reviewing this post. Maybe after a little tinkering I will try something more complicated.

Darrell Howard Whitefish, MT Outlaw 56 Ford F-100's

Charlie,

While I think Frank hit the nail pretty well, try lowering the float a little on the Edelbrock, if you go to run it again. Mine did that when it "tilted". We use a lot of "rolling" curbs in my area, so turning into a driveway was enough to cause it. Made me miss the center hung floats in the Holley's. Didn't seem to take much, and didn't lean it out too far.

miker
55 bird, 32 cabrio F code
Kent, WA
Tucson, AZ