I blew the motor a week or so ago and had it pulled apart today. I need 4 pistons if anyone can help I would appreciate it.Who makes them or where I can get some? maybe someone else with a blown motor 03?
If I had it apart, I would just replace the whole set. I would suggest a set of CP pistons. If the engine ran lean enough to damage 4 pistons the other pistons and rings had to have been exposed to extreme heat.
Piston (as well as bearing) grading is normal at the OEM level due to the fact that they can't hold the tolerances required. The grading is based on cylinder size which the parts or service dept. should have published.
Piston overheating cause has been identified by the guys here, no guess work required.
If 4 pistons have seen over 900 degrees, why would the other cylinders not see similiar temps?
If you still have doubt, conduct a Rockwell test on the "Good" pistons and compare to a new piston.
We haven't discussed signs of ring overheating which I'm sure you will see.
We sell Manley, ModMax And JE Pistons all are suitable for your application.