The roller bearing will free things up abit. Take a pro mod engine with std cam bearings or any engine. Install the valve train then try and rotate it. Very hard to move. Now take the same engine and valve train combo, install roller cam bearings then try and rotate the engine. NIGHT and DAY differance. You will not even believe it. If roller bearing were not the ticket, there would be many after market roller rockers out there with out bearings just roller tips, but there isn't. So we decided to build what the industry expects. "What you get", 7075 alum billet rocker arm body's, dual torrington roller bearings, 1.65 true rocker ratio, 8620 gun drilled hardened shafts, machined nylon tubeular spacers, billet rocker stand towers with ARP studs. Rockers can be oiled factory stock or changed over to pushrod oiling. Qustions please just call.