as much as i hate to say it. you might be better off getting the piston machined a bit to clear the plugs.
getting a shorter reach plug would help too.
OR... you could machine out the current spark plug threading. & run a new threaded insert to slightly shift the plugs up a hair(enough that they won't hit at 8000+rpm)
option A is safer
getting a shorter reach plug would help too.
OR... you could machine out the current spark plug threading. & run a new threaded insert to slightly shift the plugs up a hair(enough that they won't hit at 8000+rpm)
option A is safer
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