Always had a stumble around Tq peak at high boost with IR's no matter how small I set the gaps.
(I cheated a little and gave it some more advance around that zone and this helped but didn't cure it 100%)
If it's "orbital" you have much bigger issues ;)
(think you mean rotational)
The PMoI on a 3" shaft is very low so no real gains to be made there it's a bit of a placebo effect.
As I've said before most people are replacing Stuffed 2 piece shafts with a single piece so the improvment is...
Kenny: If you keep it out of detonation it shouldn't be an issue assuming everything is flat/true and the HG is tourqed correctly. (including a retorque)
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