Lunati 10180700K Voodoo Complete Kit (V250H-12) V250H-12 Complete Kit for 4.3L V6 Chevy 250/256 Advertised Duration, 207/213 Duration at .050", .437"/.455" Lift, 112 Lobe Separation 1000 - 5200 RPM range The best choice for all TBI and MPI applications. Expect strong low to mid range HP and torque gains. Excellent for RV type vehicles, pleasure boats or towing applications. Good idle