We offer Johnson / Topline "Hylift" American Made Heavy Duty Standard Hydraulic Lifters. Great quality at a great price. Use these with both stock and most performance cams under about .510" lift, especially if you are using non adjustable factory stamped steel type rockers. These work great for up to 5500 RPM. If you intented to go beyond that point, then we recommend going with our "anti pump up" style of lifters along with an adjustible valve train such as roller rockers, etc.