Zipper's Performance Red Shift Cams TC User Manual
a. Rocker Arm Pushrod Cups - Visually inspect each rocker arm pushrod cup for a proper 360
pushrod tip sealing ring. If you
only see a wear pattern that’s 2/3 of a circle, you’ll need to either replace, or lap the pushrod cup until a full circular sealing
ring is present. All oil to the top end travels through the pushrod and into the rocker arm at this point, so a leak here will
diminish the oil pressure to the top end.
b. Rocker Arm Valve Tip Pads - Look for damage on both the rocker arm Valve Tip Pad, and then the associated valve tip itself.
With the right tools, it is possible to resurface the tip, if the damage is minimal. Repair or replace as necessary for your
c. Rocker Arm Endplay - Follow the factory Service Manual’s procedure and tolerances. Repair or replace as necessary.
d. Rocker Arm Shaft Diameter - Follow the factory Service Manual’s procedure and tolerances. Repair or replace as necessary.
e. Rocker Arm Bushing Clearance - The pushrod side bushing takes a beating if not properly lubricated. Follow the factory
service manual for the proper inspection procedure, and use the factory tolerances as your guideline. Repair or replace as
f. Rocker Stand Clearance - Follow the factory Service Manual’s procedure and tolerances. Repair or replace as necessary.
10.) Rocker Box to Valve Spring Clearance –
If using late model
96 / 103 style heads with factory-equipped beehive springs;
rocker box clearance will not be a problem. Any dual or triple
spring pack must be checked, as they commonly hit the lower
rocker box, and potentially the top lid. If an aftermarket rocker
box is being used, always check for spring clearance, including
the top lid. A minimum of 0.060” clearance must be present
around the top of the spring pack.
To ensure proper alignment of the lower rocker box
when checking for clearance, use 2-3 tapered (alignment)
screws to hold the lower box in place. Using a standard zip-tie,
make a 2” loop, and make sure it fits around the top spring
collar. If the zip-tie doesn’t fit between the spring pack and the
rocker box, then remove the rocker box and cut material away
until it fits.
Check for clearance between the spring
retainer and the lower frame boss above
intake and exhaust springs. Clearance as
needed. Verify you have at least .060”
clearance AFTER assembly.