I will vouch for Jims work all day long! But his turn around time and communication are by far the poorest in the industry! For as much work as he puts out and buisness he gets, he should not be working any other jobs! Ive dealt with Jim many ocassions, both mine and the girls bikes have port jobs and parts sales from Jim. Man do they run hard, but Jim is near impossible to get ahold of. He had me down a whole summer once!
Also im not to pleased with his ability to dial in compression, i had custom cut domes that he orderd through noss and they were way out of the ballpark on what they should have been(and what he said they would be). But like i said my cylinders look beautiful and run hard!