Head
has about .032" crown to take out of top middle. This
head is a perfect candidate for heat straightening to
reduce amount of metal needing to be removed to level the
faces. EXTREMELY rare. Cutter should be stopped before it
reaches the ends of the head; so the area under the end
towers are only skimmed. This will all need to be done by
a competent shop in combination with realigning towers
(align boring if necessary), straightening and surface
milling.
Since
towers will need to be removed to shim them; and to
possibly machine very slightly after oven straightening;
you can use your old head's towers or we can provide
another set for $80. For some reason decades ago the caps
were removed and lost. This was pulled from a very long
term storage area; and was obviously stored a long time
before that as it is dirtier than usual and a fair amount
of bugs once used it as a temporary domicile. Any studs
that are left are rusty or bent or otherwise
UGLY.
When
head gasket blew on this car due to the warpage; it
burned very slight tracks from combustion chamber 2 to
combustion chamber 3. I'm guessing whoever dealt with
this originally wasn't aware that this is situation is
somewhat common and is easy to fix by "heliarcing" and
then resurfacing head. (Nissan dealers almost always just
threw on a new head) Again; you only want to surface down
the minor weld so head is flat; only the slightest
skimming of the head surface should be done; as this
should be done after oven straightening.
Bottom
has about .032" warp.
Average
thickness at front of head is 4.529"
Average
thickness of rear of head is 4.529"
DATSUN
U20 USED HEADS
Info
For
General Info on U20 Heads click on Rebuilt
Heads
Info.
