Reliable 650 Hp Sbc

As for a camshaft, Miller recommends a DMR-spec flat-tappet hydraulic with 244/246 degrees of duration at 0.050-inch tappet lift with 0.534/0.544-inch valve lift at a 1.6:1 rocker ratio with a lobe separation angle of 113 degrees installed with the intake centerline at 110 degrees ATDC. The earlier 455 engines enjoyed a stock 10.25:1 compression, while later engines dropped to roughly 8.5:1. More compression for the later engines can be gained with Speed-Pro forged pistons that will also add durability.


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