PRW 15 PRW Billet Aluminum Stud Girdle User Manual

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Step 4
Pontiac, Small Block Chevy, & Small Block Ford
Slide the stud girdle onto the RockerLocs (Make sure the machined side is facing up). It may be necessary
to wiggle the stud girdle to line up all of the RockerLocs, but do not force it.

Canted Valve Engines – Big Block Chevy & 429-460 Ford
Without using force, slide the stud girdle onto two of the top row of RockerLocs (Make sure the
machined side is facing up). Move the stud girdle down until the bottom row of studs is centered in the
bottom row of holes. Then slide the remaining RockerLocs through the bottom holes and thread them
onto the studs.

Note that the angled holes in the stud girdle may require movement of the stud girdle up and down so that
the lower row of RockerLocs will line up with their corresponding studs. Once the bottom row of
RockerLoc threads are started, install the remaining two intake RockerLocs to complete the installation.
At this point it may be necessary to wiggle the stud girdle to line up all of the RockerLocs. Using this
technique, they should all start and go on correctly.

Step 5
With all of the RockerLocs installed and hand tight on the rocker arm, gently move the stud girdle up or
down to make sure it is centered on the RockerLocs. When this is done, lightly snug up the through bolts
that are located on the sides of the stud girdles.

Step 6
Next, you must check the clearances between the rocker arms, stud girdle, and RockerLocs. With an eye
on the pushrod side of the rockers, rotate the engine through at least two complete revolutions to make
sure the stud girdle is not too far down on the RockerLocs. The rocker arm must never come in contact
with the bottom side of the stud girdle. It is also recommended that you check the slot in the top of the
rocker arms to ensure there is no contact between the rocker arms and the sides of the RockerLocs.

Step 7
Check your camshaft installation instructions to obtain the specified setting for your valve lash and adjust
accordingly. (Note that the stud girdle is not meant to keep the RockerLocs from rotating. It is designed to
minimize rocker stud flexing. It is imperative that the RockerLocs and set screws are properly installed. If
not, they will not stay tight and the end result will be improper adjustment.)

Step 8
Finally, check the valve cover and stud girdle clearance. The stud girdle should not interfere with the
valve cover. If you find any contact between these two parts, call your local PRW distributor for a
suitable valve cover replacement.

p:\product\installation guides\ms word\15 - alum stud girdle install guide v1-5.docx

PRW Industries, Inc.

1722 Illinois Avenue

Perris, California 92571

Tele: (951) 436-7900 FAX: (951) 928-8555

Tech: (888) 377-9779