The bike runs real well up to a little over 4k rpm. Gas mileage has been about 42. It pulls my tent trailer well also. The temps are good unless sitting in traffic on a hot day. First time out was 251 cams, and domed pistons with comp 10-5-1. Ran very hot, no low end power, all on the top, and pinged like crazy, no fun to ride on a hot day. The only thing better than the way it is now would maybe be a bit better cam and a better pipe. Still thinking about those Yuill Bros pipes to get the heat off both of our right legs better. I don't have the specs of the heads but Dan Baisley at Baisley Performance is a super nice guy to talk to. I had an issue with the seals deciding to leak and he went through them and gave them back to me NO CHARGE. Great service, I highly recomend them.