ARC 6248 Billet Long Rod is for Modified Animal engines but can also be used in the World Formula, LO 206, 1/4 Midget engines.
It is 3.740" from center to center and fits the stock crank with the 1.098" stock crank rod journal.
It uses a .490" wrist pin.
Can not be used with the stock piston. Needs to be used with an aftermarket piston such as a Wiseco that accepts the .490" wrist pin. Note these pistons need to have as much as .100" removed from their top to get the proper piston pop up.