Mark, I am not sure, I bought a Picco 45 with 67 drum rotor from aust. This motor is the SAW and oval record holder down down under. I have a new SGX I will drop it into. Andy recommend a 1655 at 4.1 to 4.5. Looks like Aaron was able to pull a 1657 but he did not give me any more detail. I would like to bit of a spread, How about a recommendation.