OK,so is the rod from the 17 hp engine longer than stock 12hp engine? Is the rod journal on the 17hp engine the same size as the 12hp engine,or do you have to use the 17hp crank with the 17hp rod? I ask because I have the ARC rod for my 12hp engine it uses the AVS piston and fits the rod journal on my crank.ARC makes another rod but it is only .050 longer than this rod,and this rod is about 3/8" to 1/2"(I haven't measured exactly) longer than the stock 12hp rod.I understood that in order to use the short AVS piston in my engine I needed this rod.