i added a set of 1.5 ratio 3/8'' stud proform aluminum roller rocker set, although i dont have roller lifters, or a 'roller cam' setup. i was wondering if anyone has seen any kind of performance increase from a high performance 357. i use a comp cams xe268 with performance hydraulic lifters, i also have screw in studs and stud girdles. im not expecting much hp increase from these roller arms by themselves, but from what i do hear there tend to increase your gas mileage anywhere from 2-3mpg, while making it a smoother revving engine. any info is appreciated on that, thanks.