I know when I did the 103 big bore kit in my 08 the big bore kit came with the SE clutch spring.
It would seem that when the MOCO went from the 96 engine to the 103 engine they would have put a stronger spring in the clutch. I would compare part #s on the stock clutch spring and the SE clutch spring before jumping into doing this upgrade.
I would think that just doing a cam upgrade would not be enough gain in torque to warrant a clutch spring upgrade. So make sure the clutch is adjusted correctly first.
Also when hitting the top of the rpm power range which in most cases it will be somewhere around 4500 rpm +/- and above the torque curve is going to start dropping off and the higher the rpm the more the torque curve will drop so don't confuse this with with a slipping clutch.
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08 FLTR candy red sunglo,with 2015 103 HO, V&H Dresser Duals with Monster Rounds, Power Vision tuner, Willy Shiny Wheels and Forks and a bunch of other stuff.