I installed the 3SX SOHC lightweight pulley a few days ago but it reads that it may take up to 7 days for the ECU to relearn to weight ratio relative to the crank. Difinite extra power and seems to lift the front end a little higher on takeoff. The 3.0 liter stealth and 3000gt motors are very well balanced from what I read so the counterbalance of the crankshaft is very slight. Only problem I had was trying to hold the engine while I torqued the crankshaft nut to 136 ft lbs. I ended up slipping the timing by one tooth and had to remove all the covers to reset the timing marks. But man that tach needle really jumps now. I think a tool to hold the camshaft intake gear would be in order here but only for an AT transmission as you can leave it in gear and have someone hold the brake pedal down if you have a stick. Maybe some holes drilled into the crank pulley so a hold-down bar with pins would work also. Good luck and thanks 3SX
