I have read that there was a lighter flywheel (like 16 or 17 lbs.) in the early 80's maxima that fits Z's. My question is.. Is this flywheel the 240mm version or the 225mm? I am building a budget fast car, and I hear that the 240mm clutch has like 750lbs clamping force as compared to the 225mm 500lbs. anyone care to elaborate on this?