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37 Special carb change


tin knocker
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Some time ago Jon (carbking) was gracious enough to give me step by step instructions for replacing the original Stromberg with one of later vintage. I have finally gotten at it and have another question.

I would like to attatch the tubing for heat to operate the automatic choke to the pipe that housed the automatic choke coil for the original. Since it is recessed into the exhaust manifold is it possible that the hot air taken from there would be too hot?

Rollie

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Well Jon, I now have the newer NOS carb on my 37. The difference between the old and new carb is night and day. I didn't know that the car could run this smoothly. It starts right off, idles better, and has no hesitation or stumbling on acceleration. Since I could only get 10 mpg before I believe my mileage will also improve somewhat. Previously I had the starter button under the dash. The new carb has the starter switch so I wired it in and now it starts with the foot feed as it should. When my son in law comes over with his high tech camera I will try to get him to post a picture.

Many thanks, Rollie

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Rollie - glad it worked out for you. Both the 1937 and 1938 Buicks used both Strombergs and Marvels. The Strombergs were experimental; and the Marvels weren't even worth mentioning. Buick pretty well acknowledged this in 1939 when replacement units were being sold through Buick dealers. Most of the 1937 and 1938 carbs were trashed then, as Buick owners wanted to be able to drive their Buicks. Your car simply waited longer to acquire a real carburetor.

Jon.

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For six years running I have not had even the slightest problem with the Stromberg AAV1 in my '38. The choke works as it's supposed to, and the carb preforms properly throughout it's range of operation.

In respect to your knowledge carbking, what are the past problems associated with the AAV1?

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<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">For six years running I have not had even the slightest problem with the Stromberg AAV1 in my '38. The choke works as it's supposed to, and the carb preforms properly throughout it's range of operation.

In respect to your knowledge carbking, what are the past problems associated with the AAV1? </div></div>

The choke was the biggest problem. There is a bulletin suggesting major surgery on the choke, which, if done, will allow the choke to almost work in very warm climates. I have yet to see one work well in the northern states (other than in July <img src="http://forums.aaca.org/images/graemlins/wink.gif" alt="" />). Once the engine was warm the 1938 carburetor worked fairly well; although for 1939 and the AAV16, both the idle circuit and the main metering circuit had major changes. The changes involved additional airbleeds (smaller), and more strategically located; with smaller jets. The 1939 carbs were more efficient (fuel economy, as well as driveability) than the 1938's.

Jon.

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  • 7 months later...

I'm dragging this thread up from the dead to ask what carburetor you used to replace the stock unit and if it is still working well.

I have a 38 Special with a Stromberg AAV-1, and I have had a fair amount of trouble getting the car to run well with this carb. I had been considering shelling out the cash for a professional rebuild of the AAV-1, but I don't want to spend the bucks if there is a better carb out there!

Thanks!

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Grant, I used a NOS carb that I bought from an ad in Hemmings. This was several years ago. I talked to the seller (from Mass.) who didn't know what year it was for but it is likely a post war carb. As long as it has 3 mounting holes which I believe identifies it as being for the small engine it shouldn't make a difference as to the year. If someone knows how to date the carb I could look for some numbers on it. If you find one, ask for advice on the linkage arrangement before you attempt to fire it up, VERY IMPORTANT. I also found an easy way to hook up the automatic choke and will try to post a pic. I found this to be a simple switch once Jon explained it and well worth while.

Rollie

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I think my '38 runs with an AV167, which I think comes from a post-war car. One of the parts catalogues I once looked at listed it as 1946 or 1947, but added a footnote that it was used as a replacement for the Marvel carb on pre-war cars.

The only issue is that I don't have the correct air cleaner (although it looks about right). When I bought one that looked like the correct one for '38, it wouldn't clear the more modern thermostatic choke coil.

Jeff

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