1995 GMC 7.4 liter, 4l80E, 4.11:1 full floating rear end with 7427 computer. Doug thorley try-wye headers and K&N filter charger intake

replaced throttle body and manifold with edelbrock MPFI conversion kit, newly rebuilt bottom end, put a comp cams extreme roller lifter and rockers with a mild 264 grind with flattop pistons (9.2:1 comp.) with edelbrock 60499 performer heads. Major motor changes and major tuning changes occurring.

john