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Post by Deleted on Feb 1, 2010 14:44:39 GMT -5
"The beast" had an original (I think- see below!) Rochester 750 on it when I bought it. Didn't look all that close 'till it started "bogging down" @ ~40000. After taking a look, I saw someone (IDIOT!) had sawed off the nut on the front of the carb. Apparently he then noticed it was leaking @ higher RPM. So, what did he do? He just slapped some sort of "gunk" over it & sold the car that way! 2 questions: 1. I picked up an Edelbrock Performer 750 w/ 300 mi on it cheap. Car runs good, but it feels like the Rochester was stronger when I floored it before it started leaking. Am I imagining things? 2. If the above is true, would it be best to then go back to the Rochester? I know that that's true for sake of originality, but how about just performance? If so, I'll have to find the screw-in that goes into the front of the carb. Anyone have 1 or know where I can get 1? Thanx, Ralph
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Post by 442chuckie on Feb 1, 2010 14:57:35 GMT -5
When you say 'nut' on the front of the carb, are you referring to the fuel inlet?
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Post by Deleted on Feb 1, 2010 15:27:14 GMT -5
Forgot- here's the carb data: On tag: 1901 Ser# on body: 8904 1901 2126 W Ralph
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Post by Deleted on Feb 1, 2010 15:29:50 GMT -5
When you say 'nut' on the front of the carb, are you referring to the fuel inlet? There's the "normal" fuel inlet on the right front (seen from the driver's side). The one I'm talking about is larger diameter & the connector faces directly to the front from the front of the carb. Ralph
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Post by RAM Z on Feb 1, 2010 18:33:40 GMT -5
Dont spin it to 40000 Ralph and you wont have a problem!
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Post by Deleted on Feb 3, 2010 9:35:36 GMT -5
Dont spin it to 40000 Ralph and you wont have a problem! & why, pray tell, would I want to limit revs to 4000 (max torque) & max HP is @ 5000? The carb I'm talking about doesn't look exactly like the one on your car. Mine has the large diameter connection w/ the nut almost directly on the front where yours is, but the inlet w/ filter is to it's left pointing to the passenger side of the car. Any thoughts? Ralph
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Post by ftw65w29 on Feb 3, 2010 16:30:19 GMT -5
"The beast" had an original (I think- see below!) Rochester 750 on it when I bought it. Didn't look all that close 'till it started "bogging down" @ ~40000. After taking a look, I saw someone (IDIOT!) had sawed off the nut on the front of the carb. Apparently he then noticed it was leaking @ higher RPM. So, what did he do? He just slapped some sort of "gunk" over it & sold the car that way! 2 questions: 1. I picked up an Edelbrock Performer 750 w/ 300 mi on it cheap. Car runs good, but it feels like the Rochester was stronger when I floored it before it started leaking. Am I imagining things? 2. If the above is true, would it be best to then go back to the Rochester? I know that that's true for sake of originality, but how about just performance? If so, I'll have to find the screw-in that goes into the front of the carb. Anyone have 1 or know where I can get 1? Thanx, Ralph The reason being the after market carburetor needs to be adjusted to match your engine. Odds are the after market carburetor is a little rich for your combination. I went with a 625 CFM Carter and it ran just as good as the Rochester that was on my 442.
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Post by RAM Z on Feb 3, 2010 18:03:13 GMT -5
I was referencing where you said you spun it to 40,000 rpms in your first post Ralph.
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Post by Deleted on Feb 5, 2010 13:22:23 GMT -5
I was referencing where you said you spun it to 40,000 rpms in your first post Ralph. ;D It'd have "spun" all right!!!! Ralph
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Post by Deleted on Feb 5, 2010 13:24:52 GMT -5
C'mon, someone give me an analysis- should I stay w/ the Edelbrock, or try to find the "blocking plug" for the Rochester? Ralph
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Post by 442scotty on Feb 5, 2010 15:06:59 GMT -5
I have an edelbrock 1411 (750 CC) on one of mine...runs great....and I have a Rochester 4Jet on the other...also runs great...If you dont mind messing up your front pipes have an O2 sensor bung welded in then use an AEM air fuel guage to dial in the Edelbrock...Made a big difference on my car.
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Post by Deleted on Feb 7, 2010 14:29:17 GMT -5
So what you're saying is that one is about as good as the other- only factor would be I don't (assuming mine is original!) (4GC?) have the original on it! ? Jasen, Br[O], Mike, ?, your input? Ralph
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Post by bubbasz1 on Feb 7, 2010 15:01:59 GMT -5
The 4GC is an old carb, you might have to fiddle with it, mine runs fine(almost) but I am in the middle of rebuilding a true 442 4GC for the spring. I probably will still have to fiddle with it but I don't mind.
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Post by BR[] on Feb 7, 2010 17:59:34 GMT -5
So what you're saying is that one is about as good as the other- only factor would be I don't (assuming mine is original!) (4GC?) have the original on it! ? Jasen, Br[O], Mike, ?, your input? Ralph Your in trouble.........you forgot Jeffy and he's the carb guy. I never had any problems with the 4GC. Little teakin' and they run fine. Now correct me if I'm wrong..... your car is one of hummmmm maybe 2 in Germany. Who in the hell is going to know the difference over there? Especially when it's sittin' under the big silver air cleaner and you can't see it.
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Post by Deleted on Feb 10, 2010 8:38:38 GMT -5
I "forgot" Jeff, but he didn't mind! See above. As far as it goes, you're right about most not knowing the difference over here, BUT there are some real freaks over here that DO know the difference when they compare an Edelbrock to a Rochester! Not necessarily on an Olds, but other GM products from the 60's as well. SO... I'll include a pic on my next forum "look-in" of mine & then ask if anyone has the screw-in "plug" w/seal that's leaking on mine. Thanx, guys! Ralph So what you're saying is that one is about as good as the other- only factor would be I don't (assuming mine is original!) (4GC?) have the original on it! ? Jasen, Br[O], Mike, ?, your input? Ralph Your in trouble.........you forgot Jeffy and he's the carb guy. I never had any problems with the 4GC. Little teakin' and they run fine. Now correct me if I'm wrong..... your car is one of hummmmm maybe 2 in Germany. Who in the hell is going to know the difference over there? Especially when it's sittin' under the big silver air cleaner and you can't see it.
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Post by Deleted on Feb 11, 2010 9:44:08 GMT -5
Here's a pic of the carb. The screw-in "plug" I'm talking about is under the blue "blob" on the front! Ralph
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Post by Big Mike on Feb 11, 2010 10:25:54 GMT -5
Here's a pic of the carb. The screw-in "plug" I'm talking about is under the blue "blob" on the front! Ralph Ralph: That's not even a 4GC, I'm not 100% positive that's even a QJet carb from an Olds. Most Olds have fuel inlets that come straight out from the front of the carb. If you are looking to keep the same look you have now as well as keep the same carb I would go with a quality rebuild of your carb. If you want to go back to the original 4GC, or an original Olds QJet then I strongly suggest contacting Sparky at Sparky's Carburetor Service and buy one of his rebuilt and tested units and/or have Sparky rebuild your carb. However, Sparky may lecture you on having a wrong carb on your Olds. If you want a new carb than I would suggest an Edlebrock or Holley, I personally like and use Holley’s, {although others like theirs, I've always hated the 4GC’s}. If you go the new route I would suggest using Summit Racing for either Edlebrock or Holley crabs. Summit also sells rebuilt QJets, but if you go that way, go with Sparky. www.sparkyscarbs.com/
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Post by bubbasz1 on Feb 11, 2010 10:28:31 GMT -5
I agree with Mike, it's not a 4GC. Looks like a quadrajet, post a picture of the intake manifold and a couple more of the carb. Sometime in late 65 production they went to a quadrahog but I ain't never seen one!!!
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Post by RAM Z on Feb 11, 2010 11:27:34 GMT -5
I think Ralph has an Edelbrock manifold.
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Post by Deleted on Feb 13, 2010 15:11:36 GMT -5
Right! It's a performer 455! I thought mine looked strange for a 4GC! I'll post a couple more pics the next few days of the carb itself. Thanx 4 the input! Ralph I think Ralph has an Edelbrock manifold.
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