From the bottom of
the top collar to top of installed seal you need 5/8” min.
Set up coil bind with
.100 to .150 over cam lift, when checking the coil bind at lift check to
see if1/3 or less of coils are
touching if ½ of coils are touching each other you will get a ticking
sound like lifter noises. It's call “coil bounce ”.
Some heads the inner
springs will coil bind before outer spring coil binds, the ev and duel
cam heads if you remove lower collar and just use spring shim. You increase
coil bind and stop noisy top end, you still have to test coil bind limits
and inspect coils at cam lift specification.
Check head oil drain
hole for size at top of hole, many need to be open up or taper for proper
oil drain flow.
Try to set up heads
with 90-100 psi + value seat pressure.
Check value guide to
stem clearance, normal ev get tighter
Cast iron guides need
min of .001 clearances, bronze guides need .002 min clearances.
Bronze guide if worn
you can knurl i.d. and size, don’t always have to be changed.
When you inspect value
stem end if it flared coil bind can be to tight, or to many high rpm, check
to make sure oiling system is working at highest pressure. Check rocker
arm stem oiling hole for size and it’s open. Check rocker arm side clearance.
Shove & Sportster
and early Ev rocker boxes need to be vent for cooling-air pressure relief-proper
oil pressure.
Lube stem before installing
into guide and seal before installing spring.