Has anybody ever built an upgraded 425 motor? I was wanting some more power with out going to the stroker 600 setup! Starting with a 11:1 wiseco, 500 HO camshaft, ported head & exhaust. I may have to fill the ports a little with some weld to get the mid-range up where I want it. Riding at 9000+ feet really sucks the power out of it now!