A 10.0:1+ compression ratio, an aftermarket/ported intake, headers, lower rear end gears, and a 3000+ stall speed torque converter are highly recommended. Howards Cams 120406-08 BBC Gen 6 Hydraulic Roller Camshaft Specs. Fits Gen 6 454-502 Big Block Chevy engines from 1996 through 1999.Basic RPM Range: 2600 to 6400. Valve springs can NOT be used. Howards Cams designed this Hydraulic Roller camshaft for high performance on the street and on the drag strip. Howards Hydraulic Roller Cams - From mild to wild, they are the ultimate in performance!