Have kind of a stupid question.  I am in the process of installing new pistons and rings in my race motor.  The motor is a 800 Polaris XCR.  I have a new set of Wiseco Pro-Lite Pistons and Rings and a new set of Polaris OEM Pistons and Rings.  In your opinion what is the best piston to put in?  I have always likes the OEM ring better then the Wiseco ring.  The wiseco piston is stronger then oem I believe.

Thanks Riley

You are correct about the Wiseco rings, they dont last as long as an oem Polaris. The Wiseco's are definitely lighter and stronger, especially in a high rpm application. Make sure you have the correct piston to wall clearance, they usually need more since they are a forged piston and expand more than an oem. Have run both with good success, but like the Wiseco's better

sounds like you dont have enough relief on the exhaust ports you might have to chamfer them more... as for pistons i like wiseco just because they are lighter and its less stress on the crank...

   I had this same problem. I sent the pistons to Wiseco they told me that the piston fell into the port. Funny thing Wiseco pistons are the only ones that fall into the port. I use OEM now no problem. I have been running this engine for over ten years. The only pistons to fail were Wiseco.         

                                Super Stock

Ask your engine builder on the clearance he should know.....I use many different Wiseco's and on one motor the clearance for Wiseco is 4.5 thou, the engine builder wants 5.5thou.... Usually if you have a failure with a wiseco it is improper break-in