Top end is fresh with new rings after i broke the glaze on the cylinders. Gap on the rings were in spec also. I have run about a tank through it so far. Yes, it is on the stockers. Mains at 320, runs out hard in the top end. Pilots at 30, i think 2 or 2.5 turns on the screw. It runs good down low but when you hit the mid range it starts to come on and right before the power band it hesitates. As far as porting someone had cleaned them up a bit but nothing major. I can run a 330 or 340 main with the needle is the same place and it helps the hesitation but she falls on her face up top.