This listing is for a torque/RV flat tappet hydraulic (NON-Roller) camshaft and lifter kit compatible with Chevrolet GEN I small block 265-400ci V-8 engines (non-computer controlled.) Kit P/N 306-400+SH290S+C3023K+RV943X x 16. This kit contains a RV toque camshaft and sixteen (16) lifters and (16) Performance valve Springs, cam Bearings and a double Row timing Chain set. Camshaft Specs are: ADVERTISED DURATION (INT/EXH): 278°/288° DURATION at .050" (INT/EXH): 204°/214° VALVE LIFT (w/1.5 rockers): .421"/.444" OVERLAP: 59° CENTER LINE: 112° RPM RANGE: 1200-5500 NOTES:Strong torque and good mileage. Terrific RV and towing cam. Smooth idle.