If you have one of the Polaris pistons and one of the Wiesco pistons, look at the ring end closure on both and compare these and then imo this can be a source of problems when using this type of ring end closure in the Polaris cylinder! I now use only pistons that have the Polaris type of ring end closure. I had and can confirm with photos, problems with three sets of pistons with the other type ring end closure to include total cylinder destruction/replacement.
gtwitch in wyoming
Humm I have read Indy dans Weisco rant, I know he was pissed they would not build Pistons how he wanted, no doubt Indy Dan is a deep thinker.
I built 3 pro top ends using Weisco Pistons and one has trouble, this motor that's the topic has been done 5 times that I know of . It's eaten Polaris, rktek,Polaris, and now this season Weisco and it's got more weiscos in it. The last set of weiscos their was no ring end gap butting and no push out of the ring locator pin. The rings and Above the rings on the Pistons looked fine un damaged however below the rings was scuffed and their was aluminum transfer to the cylinder, no eve dense of blow bye under the rings.
I think about this hard ... If water pump seals leak could coolant be taking out the skirts of the Pistons by entering the lower crank case then washing the oil film off the cylinder walls? I'm thinking so but if the coolant level don't seem to drop how little coolant would do the damage?