Check out this vintage Sun Analyzer I just found..

[njsteve]

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Any plug diagnosticians out there? How do they look?

The one thing I did notice is the lack of consistency of manufacture in these Autolites. At least 2 of them have different height insulators and slightly different width center electrodes. That doesnt make for a smooth running engine. At least the NGKs all looked the same.

Plugs 2, 4, 6 and 8 are on top from left to right and plugs 1,3, 5 and 7 are on the bottom from left to right.



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Looks like #4 has an extra gasket too.

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#1 is burning the best and it also looks like it has the closest gap........ #2 is the worst, very rich. #5 is close, also rich.

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Thanks Verne!
It's really hard to get those plugs out of the engine without having the residual oil in the plug tube drip down the threads and onto the insulators, so that always throws off the reading a bit on the "oily" plugs.