oliver,its like passionre said and and i can say for a fact that he knows what he is talkin about .he is an excellent engine builder and a very nice guy to talk to.i'm sure jim at passion would not mind at all if you gave him a call.we have ran a lot of his work and it will will run right with and better than some of the more well know builders motors and he won't rip you pricewise and he is always there after the work to help with any problems or questions you may have.