Quote:
Originally Posted by apache727
as far as I know about 20hp and they turn higher rpm. They also have the newer stlye intakes. Usually promax blocks are painted black and x's aren't... for some reason mine aren't painted either...
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The 300x's have different port timming, a little more compression and a different fuel injection system. The 300x's make around 340HP and the 300 Promax's make around 300HP. Both great motors.