Description
Limited street use or bracket racing. 10.5:1+ compression, 3500+ stall or 4 speed. 4.10 or lower gears. Radical idle.
Great high rpm power. Easy on valve train parts. Can be used with mild ratio rocker arms and traditional performance valve springs. The flat tappet lifter has a flat appearing base (this surface is slightly crowned) that rides on the cam lobe face, rotating slowly within the lifter bore to promote proper oiling. Internally, the lifter features a cavity that fills with oil and a piston that is depressed by the pushrod and valve spring. This “hydraulic chamber” provides a cushion of fluid to soften the impact on the valve train, creating room for expansion as the engine reaches operating temperature. The biggest advantage to hydraulic flat tappet lifters is that they do not require constant maintenance to ensure proper valve lash.
