Machining Instructions:
NOTE: Stand position is determined upon valve length and rocker pivot length. Please refer to the chart below to determine the proper machining dimensions.
1) MEASURE VALVE TIP TO SPRING SEAT DIMENSION (DIM A) AND REFER TO “Z” COORDINATE (DIM B) ON CHART. MILL OEM ROCKER PEDISTALS DOWN FLUSH WITH THE TOP OF THE HEAD BOLT BOSS BETWEEN #1 & 3 INTAKE VALVE. THIS IS YOUR .000” Z HEIGHT. MILL REMAINDER OF ROCKER PEDISTAL TO COORDINATES LISTED UNDER DIM B.
2) SET THE “X” .000” TO THE CENTERLINE OF #3 & 5 EXHAUST VALVES. SET THE “Y” .000” TO THE CENTER OF THE FACTORY 3/8 SHAFT MOUNTING BOLTS ALREADY MACHINED IN THE HEAD.
3) DRILL AND TAP 9/16-12 X .750” DEEP AT “X” AND “Y” COORDINATES LISTED FOR VALVE LENGTH AND ROCKER BODY BEING USED. INSTALL SUPPLIED INSERTS INTO HEAD.
4) ATTACH ROCKER STAND USING SUPPLIED BOLTS AND TORQUE TO 45 FT/LBS.

Note: Torque specs shown were calculated using 30wt engine oil on threads. You must adjust the torque spec if using a lubricant other than engine oil

PLEASE NOTE:
- IF IN DOUBT, CALL JESEL TECH DEPT AT (732) 901-1800.
- MAKE SURE PUSHROD TIP COMFORMS TO ADJUSTER CUP.
- ALWAYS LUBRICATE PUSHROD TIPS AND ADJUSTER CUPS WITH SUPPLIED LUBE. (LBE-20000)
- DO NOT LET PUSHRODS RUB AGAINST CYLINDER HEADS OR BLOCK.
- DO NOT MACHINE ADJUSTER COUNTERBORE TO COMPENSATE FOR A LONG PUSHROD
- APPLY THREAD SEALANT TO ALL BOLTS EXPOSED TO WATER OR INTAKE RUNNER.
- DO NOT DEGREASE ROCKER AND RUN WITHOUT LUBRICATION.
- DO NOT BOLT DOWN OR REMOVE ROCKERS UNDER ANY SPRING LOAD.
- DO NOT OVER-TORQUE ADJUSTER NUTS AS PREMATURE ROCKER BODY FAILURE MAY OCCUR.
- DO NOT RUN WITH ADJUSTER MORE THAN 2 TURNS OUT FROM SEATED POSITION.
- DO NOT “FLY-CUT” UNDERSIDE OF ROCKER ARM FOR ADDITIONAL SPRING CLEARANCE

ADJUSTER OPERATING RANGE
THE OPERATING RANGE FOR THE LASH ADJUSTER IS 1/4 TO 2 TURNS OUT FROM THE SEATED POSITION. THE ROCKERS ARE SHIPPED FROM JESEL WITH THE ADJUSTERS SET 1 TURN OUT FROM THE SEATED POSITION. IF ADJUSTER IS MORE THAN 2 TURNS OUT, USE A LONGER PUSHROD. IF ADJUSTER IS LESS THAN 1/4 TURN FROM SEATED POSITION, USE A SHORTER PUSHOD. NEVER MODIFY ADJUSTER COUNTERBORE TO COMPENSATE FOR A PUSHROD THAT IS TO LONG.
INSTALLATION CHECK LIST
CHECK STAND HEIGHT (IF APPLICABLE)
CHECK FOR PUSHROD CLEARANCE
CHECK FOR VALVECOVER CLEARANCE
DETERMINE PUSHROD LENGTH
PRELUBE PUSHRODS / ADJUSTERS
TORQUE ALL HARDWARE TO SPEC VALVE LASH ADJUSTMENT
1) ROTATE ENGINE UNTIL EXHAUST ROCKER BEGINS TO OPEN. SET INTAKE LASH TO DESIRED SPEC.
2) ROTATE ENGINE UNTIL INTAKE ROCKER BEGINS TO RETURN FROM FULL LIFT. SET EXHAUST LASH TO SPEC.
3) REPEAT FOR REMAINING CYLINDERS FOLLOWING THE FIRING ORDER.

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