D1VE block with D3VE heads, all stock .030 over rebuild (32 yrs and 74k ago) w/ straight up cam. 30 yr old holley 600 vac secondary on D6VE iron intake with square/spread adapter plate.
'77 Dent F-150 4x2 original trailer special.
Yesterday drove 65 miles round trip to a cruise-in/show. mostly 2 lane backroads, steady 2300 revs. A/FR was 15-15.5 hot at level cruise with 19+ in Hg.
No complaints.
So this morning I decided to pull a couple of plugs to see what I could see. Plugs are ARF (ASF?) 42 all copper basic plugs, gapped to .050 (oh, I have converted my non-CA Duraspark blue module to a red, along with bypassing the ballast resistor wire and running the special motocraft DG-316 hot coil). Plugs have been in service just shy of 2 years, and seen about 1350 miles.
Here's #5:




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And heres #4--chosen because opposite bank, opposite intake plane/side of carb, and aft cyl vs. fwd.





noted: the body of the plug inside the cyl was a little wet, and smelled of raw fuel when I pulled it.
so, I decided to go one more and pull #6 (same plane of manifold) and compare.
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Plug #6 (no gas smell):



Overall, I don't see anything too surprising/alarming. Maybe #4 the intake valve was open all night? maybe my somewhat hardened valve guide rubber seals (I replaced cyl #1 only about a year ago just to see how crusty they were--it could pinch between my fingers without breaking) are seeping a bit? but I did also take note of the "burn line" on the (grounding) electrode. It is for sure past the corner. Too much total timing?

 

There's nothing wrong with those plugs. Put em back in and forget about it.

 

oh yeah, they're keepers. Already back in and drove the truck into town yesterday.
Mostly it was just a health check with emphasis on reading the "burn line". I suppose if i don't get part throttle load detonation, it's not too much timing.