Pedestal mount rocker arms are meant to be used as a bolt-on, mild performance alternative to the higher cost of removing the heads and machining for screw-in studs. You have to remember there is only a 5/16″ screw attaching it to the cylinder head.
Scorpion Racing Products Race Series pedestal mount rocker arms can handle up to .950” lift and 950 lbs. of max open spring pressure.
Scorpion Racing Products Endurance Series pedestal mount rocker arms can handle up to .750” lift and 750 lbs. of max open spring pressure.
The attaching bolt is the weak link. However, when everything is correct it is possible to use open pressures as high as 350 lbs. spring load.
The ‘everything’ we are referring to includes:
- hydraulic lifters only
- proper lifter preload
- correct spring loads for the cam and RPM
- do not tighten or loosen the attaching screw with spring pressure against it, use a torque wrench on the attaching screws
- no mechanical interference in the valve train (coil bind, retainer to seal, etc.)
- use a rigid pushrod
- and do not over-RPM the engine into valve float.