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  #1  
Old 10-18-2010, 04:26 PM
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Default edelbrock air gap manifold for 340

Anyone have any experience with the Edelbrock RPM air gap intake manifold on a small block? I've heard its a good manifold but could freeze the throttle plates in the carburetor due to it does not have the heated crossover runnning under it if you run it in cold weather. I probably won't run it much in cold weather anyway but I could once in while in the winter months. It seems to me that it would have to get pretty cold to freeze up especially if the engine is warm. I have that air gap manifold I have never used and also have a chrome performer RPM manifold that is not an air gap. The machine shop that built this 340 already has the air gap manifold mounted on the engine but I can change it easy enough. This is going in a streetrod so its not a daily driver.
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Old 10-19-2010, 06:48 AM
340_GTS 340_GTS is offline
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You could get carb icing even at 50F degrees if the humidity is high. The air flowing past the venturis in the carb gets super-cold and ice can form in the carb. Not to say that it WILL happen, but it can. If the car were a daily-driver, and you have a lot of cool/cold weather, I'd stay away from those manifolds.
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Old 10-19-2010, 08:46 AM
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Great on the track, sucks on the street
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Old 10-19-2010, 10:15 AM
peg leg peg leg is offline
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Is on my 360 Magnum. This is a very good performing manifold, that seems to add much torque. Cold driveability is so so, but not to the point of not being able to drive in winter. It just takes more time to warm the carb. My heads don't have heat risers anyway, so the Airgap was an easy choice.
The positive attributes far outweigh the negative. I'd never go back to a heated intake.
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Old 10-20-2010, 04:51 PM
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coupe32 coupe32 is offline
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Thanks for all the info. I think I will change the engine out and and leave the air gap on it and see how it does. I can always change it out later if I have problems with it.
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Old 10-31-2010, 06:15 PM
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I have the RPM AG on my 360. The carb did frezze up once or twice, but the real pain is that the choke would allways come back on thus jacking up the RPM's.
Use a intake with a heat crossover for cold driving.
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Old 11-02-2010, 12:44 PM
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If you don't mind me asking, how cold is cold in that regard. I am thinking of using one on my 408 stroker project for the 'bird, but here in Tennessee, it doesn't get too bad, and I wouldn't drive it if it were TOO cold anyways.
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Old 11-02-2010, 05:41 PM
340_GTS 340_GTS is offline
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It could freeze up at 50 degrees, if the humidity and other conditions are just right. It all depends.
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Old 11-03-2010, 04:43 AM
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Ray Bell Ray Bell is offline
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Should be okay in our conditions, then?

What about guys in Florida and California, any problems there?
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Old 11-03-2010, 09:25 AM
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Hmm. Good info. I will likely use it only for fair weather cruising anyway. That precludes me putting one on my 1-ton though! LOL!
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  #11  
Old 11-03-2010, 01:55 PM
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Thanks again for all of the replies. Now Im leaning toward taking the air gap off of this rebuilt engine and putting the non air gap RPM manifold on. I mostly drive the car in fair weather also but we usually take the car to a run in Nashville Tn. every year in late October. I probably ought to play it safe and use the manifold with the crossover. It looks good on the engine and would run better too but I would always worry about it freezing up.
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Old 11-04-2010, 10:51 AM
peg leg peg leg is offline
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I've been running my Airgap for two years. Temperatures ranged from 20 to 107 degrees. I have never experienced any driveability issues. To give up the great performance of this intake would be a big mistake. Run the thing and see if I'm right. You can aleways change it if it doesn't work for you.
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Old 11-04-2010, 11:02 PM
dodger1 dodger1 is offline
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Another option might be to arrange for "carb heat" (as it's referred to in carbureted piston engined aircraft) Just fab up a heat stove around an exhaust source and plumb it to the air cleaner, with a manually controlled selector valve. Like every pre-EFI car had stock. Might be a bit fiddly, but it should defeat carb ice pretty quickly, and you could keep the AirGap.
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  #14  
Old 11-05-2010, 11:12 AM
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Quote:
Originally Posted by peg leg View Post
I've been running my Airgap for two years. Temperatures ranged from 20 to 107 degrees. I have never experienced any driveability issues. To give up the great performance of this intake would be a big mistake. Run the thing and see if I'm right. You can aleways change it if it doesn't work for you.
I'm 100% with you peg.
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  #15  
Old 11-06-2010, 12:58 AM
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The air gap manifold is already on the engine so I might as well try it. Thanks again everyone for your input.
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