Replacement 68 340 four speed cams

Generally speaking, the very fastest hydraulic FT cams will have about 42 to 44 degrees less duration than their advertised duration at 0.050”. Examples are Lunati Voodoo and Comp’s Mopar only HL lobes. This rule will change a bit if the supplier’s advertised duration is measured at something other than 0.006”.

Most every MP HFT cam I’ve measured runs about 48-50 degrees less duration at 0.050 than advertised duration.