My LS1, corvette drivetrain and suspension, with a lot of subframe and rollcage comes in at 3239lbs. right front 649# left front 698# front 1347# right rear 922# left rear 970# rear 1892# that's 58% rear and 42# front A little portly, and damn near the weight of a C5 vette. That's why I just installed a 70mm, T4 turbo in it. Just tuning it now, results will come