<html><head></head><body><div style="color:#000; background-color:#fff; font-family:Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:13px"><div id="yui_3_16_0_ym19_1_1511396664859_3715">I'm running Harlan Sharp 1.5 roller rockers.Lately some suppliers have marketed 1.6 rockers which gives the cam greater lift than originally ground by the cam grinder without the problems of flat tappet & stiffer valve springs used with aggresive ramps and lift.. Most 1.6 rockers are used with the roller tappet motors. </div></div></body></html>