6503 Thunderbird SC 3.8 supercharged engines can increase the blower boost to 15lbs., that is a 5psi increase. The pulley is 2.81″ in diameter. The engine will pick 25-30 hp and 40-45 ft. lbs. of torque on a stock application simply by changing to this overdrive pulley and belt kit. Easy to install and one of the best “bang for the buck” items sold.
3.8 Super Coupe Power Pully