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I made a personal observation concerning our DR ignition coils. It appears that they may be date coded. I haven't looked at the archives to study up on coils. But in comparing various coils I have I see that there is a number next to one of the threaded screws. For example: 091 coils. Looked at one that has 56. The other has 60. Looking at a 107 I see a 58. A 202 has 80. And the list goes on. There seems to be some correlation between the usuage of the coil and the years it is marked. I "assume" the number could be the year of manufacturer of the coil. It could also have something to do with the mold, etc. But I did find it interesting as I have always been into the old Delco coils. I have an 087 12-V that is embosses near the top of the case. But the 091's 12-V are embosses on the lower part of the case or can. Course you all talk about this but I never heard anyone say anything about dated coils. John
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Re: ignition coils
Here's what I have;
207 with # "5" on neg screw side (TI coil)
039 with # "5" on neg screw side
"BJ" on pos screw side, it is a TI coil on the car now so can not read the three number code, however it is a 1115176 which I confirmed before putting on car
Oh, by the way I got dinged for having long screws on the air meter adapter, ie the 5/8" ones! -
Re: ignition coils
Alan, There are still a couple of people out there that think the 63 to 65 FI air cleaner adapter screws are only 1/2" long. When in reality they are in fact 10-32X 5/8" pan head phillips screws. I realize they look tooo long but that was the way that Rochester Products made the unit. Documentation exists for these screws you know. One of the sources is your old parts books. Check out the illustrated pages for the length of these screws. Also if you plug in the part number and have the Standard Parts Catalog from GM it lists the screw as being 5/8" long. My NOS 63 unit has the 5/8"long screw. Probably gave seen many hundreds of original units that all have the long screws. Problem is that someone has been selling screw kits for years that contain the better looking-but incorrect 1/2" long screw. At Marlborough my white 63 almost got dinged for having those long screws. Carlton does agree that the screws are in fact 5/8" long. He does say that he has some issure about the head of the screw. Originally the screws were a rather thick pan head phillips. Some of the hardware variety have a much thinner head.
Alan it seems that when someone gets it in there head that a fastener is this fact or that way there is nothing you can do to correct the problem except ask for documentation. What valve cover screws or bolts does your midyear have? JohnComment
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Re: ignition coils
I would expect the numbers you are looking at are mold cavity numbers, typically molded plastic parts all carried a cavity ID number somewhere on the part.Bill Clupper #618Comment
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