How To Rebuild Your Ford V-8 351C-351M-400-429-460.pdf - Index of

Thin-wall bronze vaive-guide insert and tools required to install it. Guide is first reamed
oversize so it'll accept bronze insert. Insert is then driven into place, trimmed, expanded,
then finish-reamed.
Bronze-silicon valve-guide Inserts are very
durable. If you want to will your cylinder
heads to your grandchildren, this is the
type guide to install.
guides install in the same manner as castiron
guides.
As for bronze inserts, they will provide
better than original service. They come in
two styles, the thread-in type and the
press-in type. The thread-in insert is similar
to a Heli-Coil replaceable thread
except it's made from bronze with a
thread form on its OD only as it's going
to function as a valve guide rather than a
thread.
To install the thread-type insert, a
thread is tapped into the existing guide
bore. A sharp tap must be used for doing
this or the guide insert will not seat completely
after being installed, and the insert
will increasingly move up and down
with the valve and actually pump oil into
the combustion chamber. Consequently,
this type of insert requires particular care
when installing. After tapping, the insert
is threaded into the guide and expanded
to lock it into place so the valve and the
insert can't work sideways in the thread,
and so the backsides of the thread will be
in total contact with the cast-iron cylinder
head for maximum valve-stem-to-cylinderhead
heat transfer, or cooling. The guide
is reamed to complete the installation.
When installing a valve-guide insert, ream original guide oversize so it will accept insert.
Next, this K-Line insert is driven Into place with inner and outer mandrels. Excess insert
material protruding from guide top is trimmed off, then insert is expanded so it fits tightly
in original guide. Finally guide is reamed to slze.