My 127 makes 145 tq and 140hp it has about 40,000 on it yes it caused grief with the baker DD6 and I had to swap out the belt for a chain, the S&S clutch holds up perfectly no issues but lots of heavily loaded touring on this into vegas down to new mexico I have a jag oil cooler on it but it it has only been to 220 once, running a 51mm SE carb and Rb racing black hole pipe, I ride it very hard, Burnouts, full throttle bang shifts etc, it doesn't use any oil It doesn't run as good on 89 for sure it pings but 91 or 93 is just fine. This is a 4.25 bore with 4.5 stroke. The only things I changed from how it was delivered from Ultima is I put in S&S lifters right at the beginning and the 51mm SE carb which is much better than the 45mm mikuni that it came with, it really screams lots of power from about 2000 rpm and up to about 5200, I did try a bigger cam but ended up putting the 640 lift 268 duration cam it came with back in as it worked better. I used Mobil one at the beginning and switched to Syn3 for most of it's life, I might pull it down this winter, check the run out on the flywheels etc but it runs great. 10.2 compression.