76F26express
New member
Can anyone tell me what the letters xrx (lm318bxrx-036) in my engine model number represent? Also my engine has a black box behind the distributor that says 5.2ltr 240hp but i have not seen this on any other engine as 240 hp only 225hp. What makes my engine have 240 hp verses 225hp on all the others ive seen?