PRW 15 PRW Billet Aluminum Stud Girdle - Manual

PRW Industries, Inc.
1722 Illinois Avenue
Perris, California 92571
Tele: (951) 436-7900
Tech: (888) 377-9779
PRW Aluminum Stud Girdle Installation
Instructions
Parts List
Item Quantity
Stud Girdle for each cylinder head (either split design or one piece) 1 each
Stud Girdle RockerLoc for each valve 16 each
Step 1
Clean and inspect all parts.
Step 2
Back the set screw in the rocker arm adjuster (RockerLoc) all the way to the top of the hex end. This will
provide the proper room to set the lash on the valve.
NOTE: All rocker arm adjusters must be checked for proper clearance between the “base” or “shank” of
the RockerLocs and the inside of the upper rocker arm pivot slot. Clearance between the “base” or lower
portion of the rocker arm adjuster and the inside radius of the upper rocker arm pivot slot is critical to the
proper operation of the valve train. Rockers must maintain full range of motion without any binding or
interference between the rocker body and rocker arm adjusters.
ADDITIONAL CLARIFICATION: Before installing this aluminum stud girdle, please check to
confirm that the “base” of the stud girdle rocker arm “adjusters” (RockerLocs included with this product)
fit inside the upper rocker arm pivot “slot” and move “freely” in your rocker arm. If there is little or no
clearance, you may need to contact PRW to exchange these “adjusters” for an alternative design. Please
contact PRW Customer Service directly at 888-377-9779 or email [email protected].
Step 3
Pontiac, Small Block Chevy, & Small Block Ford
After all rocker arms are in place, check to be sure that the flat side of the rocker arm trunion is facing up
for the RockerLoc to sit on. Screw the RockerLocs down onto the rockers leaving them finger tight and
do not adjust the screw.
Canted Valve Engines – Big Block Chevy & 429-460 Ford
Due to the complex valve arrangement, the installation procedure is a little different. After all rocker
arms are in place, check to be sure that the flat side of the rocker arm trunion is facing up for the
RockerLoc to sit on. The BB Chevy (BBC) design requires patience to install (particularly during the
first installation); so please follow the instructions carefully.
At this point, install only two RockerLocs in the center stud locations on the top row of BBC rocker arm
studs. These are the studs for the intake and require the longer RockerLocs. Depending upon the cylinder
heads, Ford 429-460 may or may not use the same length studs; but do use the same length RockerLocs.