LA small block timing is suddenly way off

stillsteamn said

I'm also thinking maybe I should buy a new MSD 6AL ignition box in case mine went bad. This bad missing problem was somewhat intermittent for the last few drives before it became permanent. I could try the ignition isolation test (pull one spark plug wire at a time) but right now there is so much missing going on I don't think I could tell anything. As you can tell I'm still trying to narrow down the real problem.

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Excellent point BadSport, sometimes it's hard to stay focused all the way through a problem, but it sure makes finding the problem easier and usually faster.

If I remember correctly MSD has a test sequence than can be run on the boxes, but I don't know if it would show n intermittant or partial problem as it might be a "works or doesn't" test only.
Also, there does seem to be an awful lot of MSD failures going around lately.
Must be the China boxes are getting spread around more or something.