LS Starter Bolts – Various Dimensional Sizing February 16, 2018 Ryan Drivetrain Starter bolts vary in LENGTH due to the different starters used on different LS configurations The thread pitch is the same for all of them: M10 x 1.5 LS1 fbodys use 1 short, 1 long bolt LS1/LS2 gtos use 2 long bolts LS2 tbss uses 2 long bolts