TECHNICAL INFORMATION


INSTALLATION TIPS                                 
Soak the rockers in 30 weight oil for ½ hour.
Molly coat roller tips and the ball tip on the adjuster.
Pushrod length adjuster should not exceed more than 2 threads out of the bottom of the rocker arm.
Do not exceed 20 ft/lbs torque when locking adjuster in place. 


VALVE COVER CLEARANCE                   
Most applications will not clear stock valve covers. Follow this procedure before installing valve covers and starting the engine: Disconnect the coil. Place the valve cover in position without gaskets. Hold it in place with your hand. Ask your assistant to turn over the engine several times by engaging the starter motor. If the rockers are hitting the valve covers, you will feel the cover move. Additional clearance may be gained using taller aftermarket valve covers.


LENGTH OF PUSHROD                            
Pushrod length is determined by several factors and should be established for each specific application.
Examples:
Smaller circumference cam with higher lift lobes = longer pushrods
Resurfaced head or decked block = shorter pushrods
Angle milling head = longer pushrods
Taller than stock valve stems = shorter pushrods


VALVE LASH SETTINGS                            
Follow cam manufacturer guidelines. Each application will vary.
Hydraulic cams with stock rocker arms normally require 1 full turn tighter from zero lash (no clatter).
Roller rocker arms should be tightened no more than ½ turn from zero lash.


CHANGING ROCKER ARM RATIOS        
The amount of additional lift at the valve will be determined initially by the amount of cam lobe lift.
If lift with a 1.5:1 rocker is 0.600 at the valve, then lift with a 1.6:1 rocker will be 0.640.
Use this simple formula: 0.600/1.5:1 = 0.400 (cam lobe lift) x 1.6:1 = 0.640 (gross lift).
Lift increase = 0.040


BROKEN ROCKER ARM                            
Typically, rocker arm breakage is due to another problem. However, any breakage that is due to manufacturing defects and not abuse will be replaced or repaired. This excludes any rocker arm modified from its original state.


If you need further technical help email - tech@harlandsharp.com