Valve covers buttoned up (to correct torque spec this time... no busted bolts), spark plugs and coils done. Went with the Denso IK20's instead of the SK20R11's for spark plugs (primarily because they were listed as OEM equivalent on RockAuto). They were pretty cheap relative to most others, and figured that if I had an issue with them in the next year, I'll pay the piper and swap them out for the SK's. For coils, I went with some cheap-O's off Amazon. $100 for a set of 8 because I wanted to swap everything out to troubleshoot a slightly rough idle. Again, for that little money, I'm planning on using those as a stop-gap until I've got through with refurbishing more important things on this LX. Planning to get Densos in a couple months, so that everything stays OEM long-term. Still looks pretty crispy, having shiny new coils!
@2001LC I WILL say that I can add another data point to your observation that the interior plugs seem to loosen a little. Upon pulling the plugs, the corner plugs were real tough to pull (was a little hesitant to crank on them that hard, as it was my first time doing this job) and the interior plugs (3,5,4,6) came out with very little hassle. It follows that the only plugs that looked to be in any kind of marginal condition were those interior plugs. Additionally, the only coils in marginal condition, were the interior coils. Boots on three of the inside four were cracking, burned, dirty. The corner coils appeared to be in better condition, with one having looked recently replaced with non-OEM coil.
The photo below is of spark plugs, lower left being drivers side front, and arranged corresponding to their placement in the block. The two in the third row back (I THINK they're the #5 and #6 plugs?) look straight up toasted.
Below are the coils. All three in the lower left group were pulled from four interior slots. All three on the lower right were all OEM, in good shape. The upper two were non-OEM and in good shape. One looking quite new with a much softer boot material. The other with a shorter boot than OEM, but in good condition.
I do have a question though... I'm going to hang onto the coils in usable condition as emergency replacements (I suppose a busted coil wouldn't necessarily leave me stranded apart from catastrophic failure, but seems prudent to hang onto a few spares). Can anyone advise 1- how best to test function of the coil itself (multimeter?) and 2- can I expect a reboot and new plug seal to in any way extend the life of these old coils, or is that negligible as far as functional lifespan of these guys goes?
Next up, starter motor on Wednesday night.