Originally Posted by K1500ss4x4 I THOUGHT that the 7.4 used a different mask and would not be compatible with the OD harness/PCN etc? You almost THOUGHT correctly, but you changes the chip/bin/mask to the correct one. All you need now is correct Memcal!
1990 Chevy Suburban 5.7L Auto ECM 1227747 $42! 1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner! -= =-
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