I have a Grande with a ported and case-matched 64 Malossi, Leo Vince HM, 13.13 Dellorto, cut DMP crank, Multivar with rear spring, 9.5:1 gears, 13mm intake, malossi filter...I guess that probly covers most of it. I GPSd 44.1 before the 9.5:1 gears with an otherwise identical setup, I believe I am over 50 now, though I have not GPSd it since to confirm.