Hey Guys! Actually there is more of an answer, First try raising your oil viscosity. If you're running factory recommended weights, you probably are two light. try 20/40. Then there is an upgrade on the lifters. Go to a pick-n-pull and locate a mazda or ford v6-2.5 liter ohc engine and pull the lifters from it. They are physical replacements and have improved hydraulic functions. Gus