Chevy/Gm Lly/Lbz Release Valve Shim Kit-Eliminates Low Pressure Fuel Rail Trouble Codes Such As 1093 And Maintains Requested Fuel Pressure During Full Throttle W/Hot Program Enhancements

The Shim Kit effectively alters the spring tension of the pressure relief valve (PRV) by increasing its “pop off” pressure and reducing the fuel flow through the fuel rail return system. Eliminates low fuel rail pressure DTC codes P1093 or P0087 (low fuel rail pressure during power enrichment) caused by insufficient spring tension. Helps maintain available fuel rail pressure during full-throttle driving. Recommended for both performance or race applications.