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1 The typical Super Street rule book mandates flat tappet lifters with a maximum cam lift of 0.500-inch. So we ditched the 604’s hydraulic roller and spent a lot of time consulting with Comp Cams to spec in the ultimate race cam option for this package. What we came up with is a solid flat tappet with 0.301/0.351 lobe lift for the intake and exhaust, 240/246 duration at 0.050 lift and 108 degrees of lobe separation. To hit the 0.500 maximum valve lift we’ll use 1.7 ratio rockers for the intake and 1.5 for the exhausts. And we’ll just squeak under the half-inch lift rule thanks to a 0.025 inch lash allowance that’s pretty common. And best of all, these lobes came right out of the catalog so they’ve already been put to the test for valvetrain stability.