S&S Cycle Valve Spring Kit 106-6398 for 1936-47 Harley-Davidson Knucklehead Big Twin and S&S KN-Series Engines - Manual (Page 3)

3
Figure 4
NOTE: If valve guide holes in cylinder heads are damaged, S&S has
oversized guides available. Ream hole to the next oversize.
b. Confirm and Adjust Spring Installed Height
i. Temporarily install valve, bottom collar spacer, bottom
collar, top collar and top collar keepers. Do not install
springs. See Figure 4. Pull the top collar tightly against
keepers to seat them in top collar.
ii. Measure the distance between the top of the valve guide
and the bottom of the top collar. This is distance must be
.060” more than the valve lift of the camshaft to be used.
See Figure 3
iii. Measure the distance between the top spring seating
surface of the bottom collar the bottom spring seating
surface of the top collar. See Figure 3.
iv. Refer to the Valve Spring Specification Chart. If installed
height is more than 1.320” place a shim under the bottom
collar to reduce installed height. If installed height is less
than 1.310”, valve seat must be ground to increase valve
stem protrusion.
v. Normally the intake valve will not require a shim, and the
exhaust valve will require one.
c. Once spring height is confirmed, reassemble with springs as
shown in Figure 4.
Keepers
Top Collar
Inner Spring
Outer Spring
Lower Collar
Shim
Spacer
Gasket
Stock Style
Valve Guide
Stock Tin