Chainsaw Repair

I will Kevin, first up is the lack of the impulse nipple on the cylinder.  The 1000 series variants have that on the crankcase.  I'm guessing all of the wider crankcase saws ie (330, 380, 3450, 3750 etc) have a nipple on the cylinder base instead of the crankcase.  I was wondering if the 3mm big bore is gonna be worth the troubles, or if anyone else besides Arrowhead over on AS had done one of these conversions.  It is 3mm larger & closed ports.