Originally Posted by
German Muscle
the JP R6 lightened con rod with harcoated wrist pin will work fine in the 21-5. If you get the lightened one make sure it has the pin with it as it will only work with that one like he said above. I dont think they sell them without the pin though.
i know that the r6 most be used with the spacial pin only.
BUT,is this r6 better than r7?durability?