Gotta agree that the 500 would be a good choice. I had an Edelbrock 600 on my 292 Chevy 6, and while it made decent power, it had kinda lousy throttle response. Moved "down" to a 500, and the thing immediately got more driveable on the street with no noticeable decrease in power. With only 13 more cubes, a bone stock 305 would be plenty happy with a 500, me thinks.
I know that it's considered "manly" to laugh in the face of fuel mileage, but it's not like you can't have both good power and good gas mileage--lots of guys have done it.
Well, if you don't care about mileage, what about going through a set of rings every 10,000 miles or so?
what are the problems with the Edelbrock? they're usually pretty easy to get right. Were you running a fuel pressure regulator?
I see it as...not enough motor for your carb. A nicely tuned two barrel is good, but a smaller 4 is better. I have a holley sitting here, but I haven't looked up the number. May be big. I'd give it to you, but I'm heading out of town tomorrow so I won't be able to make it to the PO.
If none of the guys that tinkered with it told you to put a regulator on it then they don't know anything about Edelbrocks. That's the first sign that it's not the carb. What problems were you having?
Which is probably why you couldn't tune it,they work best with 5 to 5 1/2 psi over that and they will bog or flood and run rich.
Not gonna happen unless jetting is way way off, but the same could be said if the jetting is way way off on a 500cfm 2bbl, you wash the cylinders. Heck you could run a dominator and get it to drive in run ok, but that's getting a bit big, it's all in the tuning. The common denominator I see when someone hates a particular brand of carb is that they don't know how to tune it correctly. Most people want to bolt something on and go, with no tuning involved. If that is the case go with an appropriate factory Qjet. A good read if you've got $10 http://www.4secondsflat.com/Demon_Tuning_Guide.html
I run a 500cfm Edelbrock on my 1989 305 (was a TBI), lightly m***aged, with a regulator. I would not change it for anything. Both the performance and mileage are great. A carburetor with a higher cfm rating is not going to make any more power than the right size one. Poor mileage ≠ performance. One thing that you absolutely want to do with an Edelbrock carburetor, and is probably a good idea with any carburetor, is to pull the lid and set the float levels. Clean out the bowl while you are in there. Most carbs, and especially Edelbrocks, can have their float levels disturbed with rough handling. If the UPS guy dropped the box on its lid at any time, then it is no longer set properly. Edelbrocks are sensitive to fuel pressure. They don't like it over 5psi, so a regulator is a must. Regulators are a good idea for almost any setup unless it is factory stock. Even if it is, and some of the components have been rebuilt in Foreginlandia, or even here, then who knows psi what you have? I have seen too many Edelbrock carbs condemned to the shelf becuase they were the were chosen for size contrary to the recommendations, had un-set floats, or were run without a regulator, or some combination of all three.
Doesn't sound to me like tuning it properly is an option for this situation if he gave up on the edelbrock. Have you driven behind any of the guys leaving a cruise night in their street rod or muscle car with a too big holley on it, very little initial timing, no vacuum advance, too big cam etc? Talk about making a grown man cry . . .
Miguel Jordan, what the hell are you doing? Trade the 750 on craigslist for a personal m***age. the edelbrock should work fine on that car what was the problem you are having? FWIW I run a street avenger 570 on my 355 and it is plenty.
Not sure where you're at but check these CL deals for a holley carb: http://appleton.craigslist.org/pts/1939691190.html http://appleton.craigslist.org/pts/1938833583.html
Is this true with the original design AFB also? I have a 1962 327 with an original AFB that runs richer than I would like it to.
I am not up on my carbs yet, but a wise man once told me that you can not have too big of a carb. You just need to tune the carb to what is required. A motor only ****s as much air as it needs and the tuning of the carb provides the correct amount of fuel relative to this. Food for thought anyways. Peter
A 750 is too much carb for even a 327 To try to figure out what you need there is a formula ,You can use ,The simplest I always use double the cubes ,I forget the formula Im sure other guys will chime in ,Ill get slammed for this but another site has then for cheap if you want to rebuild them.....
I do not believe that this is true at all. Fuel is drawn into the engine by means of the vacuum created by the narrowing of the air p***age, called the venturi. It is drawn through a jet, which controls how much fuel goes in. If the venturi is too large in relationship to the amount of air that is being drawn in (engine displacement X RPM) then the vacuum signal in the venturi may become too low to properly meter fuel, regardless of jet size. If the carb is really too large, the vacuum signal can be lost, all together, under some conditions, shutting off fuel flow. I think that there are too many oversize carbs out there. I think too many people err when forecasting their real world RPM range. You are not idling at 1500 or shifting at 9500 on the street, so don't pick a carb for that.
i got a stock 305 in my 62 with an edelbrok performer manifold and a 650 dp a2500 stall and stock rear end and it runs as sweet as
Other than the obvious larger venturi which won't get you the throttle response, the front 2 barrels of a 750 arent that much bigger than a 2 barrel carb....if you only push you foo thalf way down it's only a 375cfm right...WOT of course it's way to big, but who goes WOT on a stock 305? it will idle and run to the grocery store just fine...
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