The missfiring of the #1 plug is no longer happening according to the timing light. All 4 give a steady strobe.
Just finished a compression check. 150 - 155 psi on 2, 3, & 4. No. 1 was 125. Went to recheck #1 and realized the fitting wouldn't bottom out (i.e. it wouldn't seal). Then I realized the plug wouldn't go in but a couple threads either before stopping. So it looks like threads have been crossed somewhere along the line. The electrode gap end of the plug stops a long way from the cylinder ID. Could this could be the problem? I've not paid attention to this in the past. Maybe there's different problem with #1. 125 sounds pretty good but it's still 25 below the rest. Or maybe it's just a sealing issue.
Can I run a reamer / tap in to clean up the threads without yanking the head? Looks to be 11/16ths thread. I'll check the neighbor and buy one tomorrow if he doesn't have one. I'll report back. If this doesn't fix it I'll run the other checks suggested. Thanks for all the good thoughts and suggestions. I'll report back.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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