A proven potent combination, these hydraulic lifter 260°/268° blend decent mid-range and top end power. Idle is slightly rough with CIS fuel injection but can be quite smooth with EFI. Made from chill hardened billets, these cams are supplied with timing gears installed. Standard valve springs work okay and regular engine speeds. (222°/225° duration @.050", .438"/445" lift) Below 5,500 rpm the 254° ABF cam set is torquier. Once above, these pull ahead with horsepower.