Good video I found over on Smarty Resource. I know the gent speaks of common rail and other diesels but good info.

 

 

Good video. 

 

I don't think any Cummins ISB pistons are OEM coated, but all in all very accurate and good video. 

 

It explains why a stock motor can run much higher EGT's and be safe. My OEM motor could hold 1450° and not be an issue to the piston, but if I were do that on my motor now I'd run into piston issues.