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there's a few options
1) just 10% smaller pulley on the SC nose - no other changes required, works with our stock tune too
2) 10% smaller on the SC nose + 7% on crank pulley (we would modify a stock pulley to keep the vibration damper aspect) - this is the point where new guts are required for long term reliability
3) above + 15% on crank, 8 rib wide & all pullies changed to accommodate the 8 ribs and water pump and alternator pulley resized to restore the original crank pulley gearing.
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