Not sure of the blue motor but the first of the 4x4 Sierra's gained a power boost with the red motor still and a better turbo damper but the 4x4 ate up the extra power.I have heard the 4x4 red motors referred to as EVO 1 engines .The green motors or EVO 2 gained strength mods for endurance but no power boost but these engines could take modification well. I read this in some info given to me by a Ford dealer here specialising in Cosworths. The person that i sold the sierra to still has this info dammit. Does anyone else here know about these blue motors.
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