Valvetrain Geometry
The Mancini rockers for SBM list a max spring diameter of 1.65". The Harland Sharp roller bearing rockers have a maximum spring diameter of 1.50". This would mean the HS is 0.150" thicker in the spring relief area. The roller bearing thickness is 0.125". As can be seen in the first picture below, the HS rocker (for TF head) even has extra metal between the two roller bearings.
The second picture below is an old Mopar Performance (by Crane) rocker compared to a HS roller rocker. If ultimate strength is the criteria, my money would be on the orange one.
The Mancini rockers for SBM list a max spring diameter of 1.65". The Harland Sharp roller bearing rockers have a maximum spring diameter of 1.50". This would mean the HS is 0.150" thicker in the spring relief area. The roller bearing thickness is 0.125". As can be seen in the first picture below, the HS rocker (for TF head) even has extra metal between the two roller bearings.
The second picture below is an old Mopar Performance (by Crane) rocker compared to a HS roller rocker. If ultimate strength is the criteria, my money would be on the orange one.