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1937 Vacuum advance problems
Not too shy to talk
Not too shy to talk

Lee Davis
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I have a '37 115C coupe and I have traced a problem to the Delco Remy vacuum advance. I bought a NOS advance with the number 681K stamped on it, because it was identified as going to my car... but it is not the same. I think the 681K fits the 110 and/or 120. Can anyone enlighten me on this situation? Hopefully to steer me to a replacement. Thanks, Lee Davis

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Posted on: 2022/1/27 13:28
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Re: 1937 Vacuum advance problems
Home away from home
Home away from home

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From a 1942 Delco catalog:
681-K is the correct vacuum advice for a 115C with distributor number 647-E
Also fits 1938 6 cylinder with distributor number 1110203
What is the number on your distributor?

Posted on: 2022/1/27 15:14
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Re: 1937 Vacuum advance problems
Home away from home
Home away from home

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It probably does not matter much which vacuum chamber you use as long as it fits your distributor. The main difference in physically like chambers is the spring. This is how the unit was individually tuned for different engines. Even so, a spring meant for a different engine will probably work just fine on yours. It may have made a difference some 80-odd years ago, but now probably not. Of course, it is always best if the originally designed chamber and spring are used.

Others may have some more to add to what I have written, and their comments are welcome and may provide better information.

Posted on: 2022/1/28 12:55
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