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Rochester 4GC 1965 442 Carburetor Replacement for Original 7025150

Rochester 4GC 1965 442 Carburetor Replacement for Original 7025150

Old June 23rd, 2019, 04:56 PM
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Rochester 4GC 1965 442 Carburetor Replacement for Original 7025150

Hello,
I have a 4 speed 65 Post 442 that has the wrong carburetor on it for the year. I know that the original Rochester 4 Jet carbs were numbers 7025150 or 151. As these were a one year only carb and very hard to find, I was wondering what the next best carb would be in the Rochester 4GC/4Jet model? This has the original 400 ci BBO engine and I have the original air cleaner, so I want to stay with the 4GC model so everything fits under the hood. I have what I think is a 7025055 model 4GC that was on the car when I got it. Does anyone have an idea if I should just run this till I find the Unicorn of carbs or is there a Rochecster 4GC / 4 Jet that would work better for for this engine? If anyone has a 7025150 carb for sale, let me know the condition and price.

Thanks,
Steve

Last edited by Big Daddy Spo; June 23rd, 2019 at 05:02 PM. Reason: additional info
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Old June 23rd, 2019, 09:14 PM
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Check with oldspackrat. Scott recently purchase a large collection of 1964 Cutlass/442 parts and some 1965. He's posted some pictures over on facebook if your on the Oldsmobile sites there.
John
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Old June 24th, 2019, 01:18 PM
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Thanks!. I sent Oldspackrat a PM, we'll see what turns up. Anyone else with an idea of a suitable replacement for the 7025150 carb in a Rochester 4 Jet? Let me know what number carb I should be looking for.
Thanks
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Old June 24th, 2019, 01:41 PM
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I have a 64 Cutlass carb. if still needing one.
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Old June 24th, 2019, 03:55 PM
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The fourth digit of the carb number is the model year, so yes, they are one-year-only. Keep in mind that 1965 was the only model year that the BBO used the 4GC.
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Old June 24th, 2019, 07:38 PM
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Thanks Gerald and Joe. I guess my question is, is there another 4GC carb that has the same CFM and jet sizes for the 65 400 engine? Will any 4GC carb work fine on the BBO engines or is there a specific carb number I should be looking for until I can get a correct one? I do have a 7025055 that came off a 330 engine. Just not sure it will be the right size for the BBO. Thanks for the help

Steve
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Old June 24th, 2019, 08:02 PM
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Later '65 442 came with q-jet, my August built '65 came with one. http://www.442bro.com/ has the info.
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Old June 24th, 2019, 08:13 PM
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I would think that a carb from a 59 thru 64 Olds 394 should be pretty close to a 65 400 carb as far as CFM , calibration , etc .
There's only a 6 cubic inch difference .
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Old June 24th, 2019, 08:23 PM
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Thanks everyone for the information. The intake manifold on my 400 is for a square-bore carb, so I would gather it had a 4 GC on it. I am running a 67 4 speed Quadrajet that I had with an adapter plate from spread to square,so I can move her around. I will check out the 394 carbs that Charlie mentioned as i think they would be a good fit. What about a 1965 4GC off of one of the fullsize cars that had a 425 in it?
Thanks again,
Steve
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Old June 24th, 2019, 09:22 PM
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Originally Posted by Big Daddy Spo View Post
. What about a 1965 4GC off of one of the fullsize cars that had a 425 in it ?
Even better .
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Old June 24th, 2019, 09:34 PM
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Great! Found a rebuilder on Ebay from a 65 fullsize # 7025050. At least this will give me something to start with until I can find the original number carb.

Steve
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Old June 24th, 2019, 10:27 PM
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Originally Posted by classicmuscle.442 View Post
Later '65 442 came with q-jet, my August built '65 came with one. http://www.442bro.com/ has the info.
I was under the impression that "model changeover" was in July or August. That would mean that 66's would be produced for showrooms and new car introduction. Some things I read were interesting, but some was pure crap. I will go back when I have time and read more.
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Old June 29th, 2019, 05:39 PM
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Replaced with a 7025050 Carb

So just to tie up this thread, I was able to buy a 1965 Rochester 4GC, Number 7025050 that was found on the 65 425 engine. Found one on *Bay in rebuild-able condition, bought a carb kit from Mikes carbs and set about cleaning and rebuilding. It cleaned up really nice and looked like it had never been apart. Will get it put in place in the next couple of weeks and see how it runs. Have the Quadra-Jet all dialed in now, so I'll leave it till I start the clean-up of the engine.

Steve



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