Looks like the RobbMC instructions specify 1/16 - 3/16 end gap.
My Powermaster/PRW billet flywheel combo had ~.25" end gap until I removed the starters internal 1/16" spacer, which brought it to ~3/16". It would intermittently grind, even with proper gear tooth backlash, so I tried an extra starter to block shim, and it hasn't done it since, fingers crossed. If it happens again I'm going to take the starter apart and try to space the pinion out closer.
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