Originally posted by ND
The con-rod in the 321P should be the R4, the R5 is only supposed to be used on the 421P. Check the rod in your engine first before ordering!
I think either rod will work in the 321P..I actually had a 321P with the R5 rod in it.
RC Target, Max Power America, SRC America, Prolevel RC, Belly Button Paints, Hobby People