Thanks for the response. Head Gaskets R&R'd three times with ARP's installed the last time. It has always spit coolant out the res. even with studs. Running "street tune" from Innovative and I rarely dog it. Run the Lucas Diesel additive in every tank in hopes of keeping it clean. Installed the coolant filtration system and change filters about every six months. Opened up the front of the stock air filter box for greater air passage and bowed to the God of the West. I have a modded EGR cooler sys. in my Shop, but haven't installed yet. I'm thinking my engine is telling me it's time to change or should I bow in another direction?