BR vs B-R on Delco Coils

[camaronut]

Ok.... I have two Delco coils.... 270 BR and 270 B-R.  I read that the BR is for 68 and B-R is for 69.  The BR is the original coil to the car.....not B-R.  69 SS 350 with cowl induction O6A build.  Can anyone clarify why the disparity and what’s the difference between them?  I know that the BR means ballast resistor,  but why the difference?  Was there a manufacturing change, etc???

[KurtS]

http://www.camaros.org/forum/index.php?topic=8929.msg147414;topicseen#msg147414

[camaronut]

Thanks Kurt....

Last night, a friend of mine who is big into C3 Corvettes told me that the connection studs were breaking loose when tightening, thus the change from BR to B-R...I guess GM made a change to the casting mould?

Anyone hear different?

[KurtS]

I doubt that would be the cause seeing I've never seen a service bulletin about that.

[camaronut]

Something about a drawing change in Sept. 1968...

[KurtS]

Yes, that's what I wrote. I had looked at an original coil drawing:
The 293 Delco coil assembly print has the following change note: 9/12/68 - B-R was BR.

IIRC, there were not other changes on that date so it wasn't tied to another change.

[camaronut]

Duh!!!! Sorry Kurt!  Another brain fart........

No reason as to why the change.....that’s what I was wondering.