Just recieved the latest run of Fox .15 b.b. R/C engins and they are the best they produced to date in fit and finish. They are now put together with socket head screws like everyone else. As a diesel it will turn a 9 X 7 Rev-up at over 11,000 Rpm. So it you would like to get an all American diesel .15 let us know we have them in stock.