Redundant I think, like the NAP-Z Nissan 4-bangers they used in pick-up trucks. 2 plugs per hole.
You gotta know that engine was making some noise and running like crap before/during all that damage.
It is nice to find the "a-ha" when one goes south and takes out a piston.
Rebuilt a 1996 200 Merc that had tried to stick 2 pistons. New sleeves, pistons, rings machine shop inspected the block. Paid one of the best mechanics I have ever known to go through everything(carbs, 100% new electronics, link and sync broke-in and run on the dyno to verify motor was tuned properly and happy. Conservative set up as per Merc. Break-in was an easy 20 hours under 5000 rpm and the first time I leaned on it for no more than 30 seconds, It tried sticking the same pistons. Never figured it out. Couldn't risk another rebuild so I parted it out.
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1996 -19' NV Flats 115 Mercury 4-stroke
1983 -20' Wellcraft Center Console 250 XS
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