COMP Cams Stud Girdles User Manual

Page 2

Step 4
When all nuts are installed and snugged down to the rocker arm, gently move the bar around to make
sure it is centered on all the adjusting nuts. The final stage of this step is to lightly snug up the through
bolts in the bar.

Step 5
At this time, it is a good idea to check valve cover stud girdle clearance. If the valve cover interferes
with the girdle, COMP Cams® has several valve covers available, or there are many suitable products
on the market.

Step 6
At this time, you must check clearances between the rocker arm, the girdle bars and the adjusting nuts.
Watch the pushrod side of the rocker arm and rotate the engine through two complete revolutions to
make sure the bar is not too far down on the nuts. Check to be sure that the slot in the rocker is not
hitting the adjusting nut. There are many different types of adjusting nuts and many designs of rocker
arms. These two parts must be compatible.

Step 7
Set the valve lash to the specified setting using the procedures as described in the camshaft installation
procedures. It is important to note that the stud girdle bar is not intended to keep the adjusting nut from
rotating, but rather to minimize flex in the entire system. If the adjusting nuts and set screws are not
properly installed, the nuts will not stay tight and improper adjustment will result.

Rocker Arm Adjusting Nuts
All COMP Cams® adjusting nuts are designed for the ultimate in strength and locking force. The stud
girdle polylocks are precision ground for minimum run out and tapered for extra strength.

Part #

Description

Stud Size

O.D. @ Rocker

4508-16

Stud Girdle Adjusting Nut

7/16”

0.555”

4508S-1

Stud Girdle Adjusting Nut
(w/ snap ring to hold girdle bar)

7/16” 0.555”

4509-16

Stud Girdle Adjusting Nut

3/8”

0.555”

4509S-1

Stud Girdle Adjusting Nut
(w/ snap ring to hold girdle bar)

3/8” 0.555”

4510-8

Stud Girdle Adjusting Nut-Intake BB
Chevy

7/16”

0.555”

4511-16

Stud Girdle Adjusting Nut

7/16”

0.555”

4513-16

Stud Girdle Adjusting Nut
(for use with Jesel Stud Rocker System)

3/8” 0.597”

Part #144

Revised 12/15/03

Competition Cams, Inc

3406 Democrat Rd.

Memphis, TN 38118

(901)795-2400 FAX (901)366-1807