I got a set of diamond pistons and the wrist pin they came with are to big for stock rods and i heard you cant use stock cir clips on them anyone know more?

 

you have to get the small end of the rod opened up to accept the bigger pin and use the spiral locks that come with the pistons and make sure you put the pistons on the rod facing the right direction or bad things can happen

 

I recently just put the Fully Coated Diamond forged set in my LSJ after my 4th piston took a complete crap on me. You will have to get the rods honed .001". You can get a little more information off of over the top performance site. Any machine shop can do this for you. It only cost me about 25$. For the wrist pin clips which should be spiral they are a little bit of a pain to install but easy after you get the feel for it. Stretch them out a little and spin them into place. Make sure to keep some pressure on it at all times. Let me know if you need to know something else.