- BTR Stg I cam for 223/230 .610"/.573" 115+2
- BTR Stg II cam for 227/234 .614"/.576" 113+2
- BTR Stg III cam for 231/242 .617"/.592" 112+2
- BTR Stg IV cam for 235/242 .621"/.592" 111+3
Lift approaching .650" or more while using stock 15 degree rocker arms with too much open spring pressure can damage valve tips long term. We recommend maximum lift of .630" and maximum open pressure of 400 lbs when using stock rocker arms.