Thread: Need help identifing
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04-21-2006 07:12 PM #1
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Need help identifing
Hey guys i'm starting to work on my chevelle again, and i'm going to take off the carb. thats on it. When i purchased the car the owner gave me a holly carb., and now i'm thinking about rebuilding it and putting it on the car. I was judt wondering if anyone could help me figure out some more information about the carb. Like what cfm and so on.
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04-21-2006 07:13 PM #2
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Here's one more pic.
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04-21-2006 07:28 PM #3
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On the choke horn there should be a couple numbers stamped. Like a 4 digit with a dash and another number, then another 4 digit number under that.Your Uncle Bob, Senior Geezer Curmudgeon
It's much easier to promise someone a "free" ride on the wagon than to urge them to pull it.
Luck occurs when preparation and opportunity converge.
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04-21-2006 07:32 PM #4
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4776=600cfm
4777=650cfm
4778=700cfm
4779=750cfm and so on.Ken Thomas
NoT FaDe AwaY and the music didn't die
The simplest road is usually the last one sought
Wild Willie & AA/FA's The greatest show in drag racing
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04-21-2006 07:32 PM #5
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Sorry if this sounds dumb, but what is the choke horn?
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04-21-2006 07:34 PM #6
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The area the choke plate is in.Ken Thomas
NoT FaDe AwaY and the music didn't die
The simplest road is usually the last one sought
Wild Willie & AA/FA's The greatest show in drag racing
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04-21-2006 07:41 PM #7
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Hey guys i think i found it. The number reads 4779-6 and underneath that another number reads 0324.
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04-21-2006 07:56 PM #8
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Does this carb have vacuum secondaries?
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04-21-2006 08:08 PM #9
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No, mechanical.Your Uncle Bob, Senior Geezer Curmudgeon
It's much easier to promise someone a "free" ride on the wagon than to urge them to pull it.
Luck occurs when preparation and opportunity converge.
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04-21-2006 08:09 PM #10
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How do u know what the difference is? Just wondering.
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04-21-2006 08:16 PM #11
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For one, since you were good enough to put up a pic, there's no vacuum "motor" on the side. Second, if you go to the Holley site it will be listed as a mechanical secondary, along with a bunch of other good info.Your Uncle Bob, Senior Geezer Curmudgeon
It's much easier to promise someone a "free" ride on the wagon than to urge them to pull it.
Luck occurs when preparation and opportunity converge.
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04-21-2006 08:18 PM #12
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Hey Bob thanks for all the good information. Are these carbs hard to rebuild?
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04-21-2006 08:26 PM #13
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The carb is pretty easy to rebuild. That appears to be an older version so it will need upgraded to blow out protection for the power valve. If your engine is fairly stock you will not be happy with the carb. It is just too big and if you have an automatic mech secondaries shouldn't be in the same sentence.Ken Thomas
NoT FaDe AwaY and the music didn't die
The simplest road is usually the last one sought
Wild Willie & AA/FA's The greatest show in drag racing
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04-21-2006 08:31 PM #14
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I'm planning on rebuilding a stock 454 soon, and i was going to use this carb. Will this carb be ok for it? Also how hard is it to upgrade the power valve for blowout protection? And which is better mechanical or vacuum secondary?
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04-21-2006 08:38 PM #15
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I would think a 750 would be fine for a 454, they just don't work real well with an automatic on the street. The secondaries being mechanical come in too soon causing a very rich condition and bog. Summit, for one, sells the blow out protection kit and everything else you would need to rebuild the carb.Ken Thomas
NoT FaDe AwaY and the music didn't die
The simplest road is usually the last one sought
Wild Willie & AA/FA's The greatest show in drag racing
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I tried rubber isolators between the frame and pump, but it made little difference. I don't mind spinning the motor over to refill the carb(s), it allows time to build oil pressure, jmho..
1968 Plymouth Valiant 1st Gen HEMI