JIMS Box 3 1208-1353 (all models of 120, 131, or 135 Alpha, Beta and EVO Mount Engines (Including Kits) User Manual
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555 Dawson Drive, Camarillo, CA 93012
Phone 805-482-6913 • Fax 805-482-7422
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No.1208-1353
A Division of Thiessen Products, INC
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Special note for Box 3:
We have changed packaging from three boxes to two on any engines ordered with the top end
not installed. We still refer to box 3 instructions sheet because this is the final information to
complete your engine assembly. We've added all the parts for the previous box 3 to box 2.
Box Three Installation Instructions
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Congratulations! You have almost finished assembly of your JIMS 120, 131, or 135 Race Kit
engine. You'll soon be ready for chassis installation, break-in and a trip to the track.
As we explained back in Box One, there is nothing particularly difficult about assembly of the JIMS
120, 131, or 135. That remains true in Box 3. All of the parts and assemblies are either stock or
Screamin' Eagle items. Only the rocker covers have been modified to clear the roller rocker arms
and special valve springs. If you are familiar with normal TWIN CAM top-end assembly proce-
dures, then you already know how to finish your JIMS 120, 131, or 135 Race Kit engine.
Use these instructions for general assembly procedures and torque specifications.
Follow the instructions packaged with the enclosed Screamin' Eagle kits to install those parts.
These kits include the pushrods.
Notes and reminders:
Cleanliness:
• Remember to maintain your work area's cleanliness.
• Inspect all parts for burrs and machining chips before beginning assembly.
• Pay particular attention to the threaded holes in the lower rocker covers where they have
been modified to clear the valve springs.
• Be sure that all threaded holes are clear and clean.
Lock patches:
• Bolts used to assemble the lower rocker cover, rocker support plates and the breather assem-
blies have "lock patches" on their threads. Blue LOCTITE #243 will be needed for the regular
cover screws.
• These patches release a thread-locking compound when they are installed.
• No additional locking compound is needed and none should be used.
• Do not lubricate the bolts before installation.
STEP 1: Lower Rocker Housings - Installation
Note: Ensure that all mating surfaces are clean, flat and smooth. Be sure the threaded holes
are clear of chips or other debris.
Important: The rocker housing gaskets must be installed correctly.
• While they fit either of two ways, only one is right.
• Incorrect installation results in a major oil leak.
• Obtain:
• A modified lower rocker housing 1208-1319.
• A rocker-housing gasket 16719-99.
• Six rocker housing bolts. (Two of the bolts are longer than the other four)