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<p>John ,</p>
<p>You are about to learn what it takes to keep a U20 Datsun 2000
engine alive . So <br>
</p>
<pre wrap="">"Oh, my gosh, this head needs "<u>Complete Over haul</u>" and what parts needed to be determined after tear down.
</pre>
We know that it needs at least an Exhaust valve that is burned ! It
appears to have been very rich and burning oil. <br>
Not knowing anything else about any possible previous work, It will
need at least:<br>
1. New Steel Intake seats ,2. Valve stem seals, 3. Exhaust valve 4.
Valve job, 5. I have a suspicion this is late model as I see a smog
check valve, so I'm guessing you had too much ignition timing
because Distributor isn't re curved to early <br>
Dizzy cam ,and or Valves too tight . Lower chain guild needs
replacement ,even though some will tell you to just leave it off ,<br>
as it is unnecessary ... I have Never ever built an U20 engine
unless it I used it . Your timing chains, tensioners, upper guide
are shot. They are at best a 50K miles only parts .Over that and
reliability of all components is a crap shoot, especially if the
upper is too loose and the upper tensioner is not shimmed . <br>
<br>
That is my over 46 years of Datsun experience opinion based on 1
pic. My recommendation is to turn this head over to a shop that
knows the U20 head and rebuild techniques, Not just any average
engine machinist ,or you will be sorry . Again only one pic and I'm
not entirely clued in ,but this is the normal scenario. <br>
Best regards,<br>
Steve Ehlers<br>
Rising Sun Performance Inc <br>
The Oldest Datsun Specialty Shop in Texas and Z car Experts <br>
est 1978 <br>
<br>
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