If you have a set of Titan or similar full roller rockers then you know that their adjusting screws are quite unique. These have a Allen head. Comes with skirted lock nut (C-AHT443 when ordered separately).
The new generation of short period, high lift cams have been developed to give the best results in large bore engines when used in conjunction with 1.5 ratio, hi-lift rockers. For the small bore range, the stock 1.3 ratio is optimum. In certain instances ratios of 1.7 to 1 are of benefit - but is really only applicable to fully developed race engines.