PRW 33 PQ Series GM LS Series Shaft Mount Rocker - Manual (Page 4)

Page 4
Step 10: To confirm proper adjuster oiling function, using pump-style oil can against the oiling hole in the
adjuster, pump the handle until oil comes out of the oil passage behind the rocker arm roller tip.
Pushrod Length; Checking to Determine Proper Length
1. With the number 1 cylinder at TDC (Top Dead Center) seat the provided pushrod length checkers in
both exhaust and intake valve lifters.
a. The base circle may be different between the intake and exhaust camshaft profiles.
b. It is necessary to check both for proper individual pushrod length.
2. With the valve lifter on camshaft base circle and valve lash adjuster rotated clockwise 1 turn out from
the seated position, install the rocker pair over the number one cylinder with the length checkers in
place. You may wish to mark the checkers “I” and “E” (for intake and exhaust) to easily identify after
removal.
3. Tighten the torx machine screws through the shaft and into the stand until snug.
a. Do not attempt to install or remove rocker arms under load.
b. To do so will likely result in serious damage to the rocker arm shaft, bearings, and/or the
rocker body.
4. Adjust the pushrod length checkers to required fitment and proper length.
a. Remove the rocker pair from the stand and then remove the pushrod length checkers.
b. Record the lengths required for reference and order the appropriate quality Intake and Exhaust
pushrods from your Racing and Performance parts dealer.
NOTE: Maximum recommended spring pressures for the PQ 2 Shaft Mount Rocker Arm System is 275 lbs
closed; and 700 lbs open. The rocker arms will clear up to 1.550” diameter valve spring. Pushrods selection is
important; these are critical parts. High quality aftermarket 4130 chromoly steel pushrods are recommended.
Custom length pushrods are readily available from PRW through your local dealer.
Post Installation Maintenance:
The synchronized oil system must be inspected periodically for obstructions that may prevent proper rocker arm
oiling. After the valve has been adjusted to camshaft specifications, verify that the 12 pt adjuster nut has
retained 25 lbs/ft torque.
NOTE: Severe engine damage may occur if the adjuster nut should come loose while the engine is operating.
Torque Specifications
8mm - 1.25 x 19mm Allen Head Pedestal Bolts 240 Lbs/Inch with Moly Lube
5/16” Shaft Bolts
26-28 Lbs/Ft with Oil
3/8” 12 point Adjuster Nut
25 Lbs/Ft with Oil
WARNING:
1. Do not re-tap rocker body adjuster hole. Doing so will damage the rocker arm beyond repair!
2. Do not over-tighten adjuster nuts or modify adjuster counterbore!
3. Do not degrease rockers and/or run without proper lubrication.
4. Do not run valve lash adjusting screw out past two threads from seated position!
5. Do not allow pushrods to come in contact with cylinder head!
6. Do not run with rough or damaged pushrod tips!
7. Do not loosen shaft bolts under spring loads!
Limited Warranty
Performance Quotient and PRW Industries, Inc. (“PRW”) warrants that all of its products are free from defects
in material and workmanship, and against excessive wear for a period of (1) one year from the date of purchase.
This limited warranty shall cover the original purchaser.