[Vwdiesel] TD vs. N/A heads

[Libbybapa at wmconnect.com]

I appreciate Roger's post and the link to the TD tech article.  I have read 
it before.  It does state that the development of the TD required some changes 
to the previous N/A engine.  What I have wondered is whether VW implemented 
many of those changes into the N/A motor also, or to what extent they ran two 
seperate production lines.  I have heard from several individuals that were 
extremely familiar with the diesels, most notably a very precision oriented 
machinist who rebuilds the heads, that have stated that there were no differences in 
the castings or the alloys between the TD and the N/A heads.  Valves were 
different.  Again, it is hearsay.  I have even seen an '86 N/A engine with the 
same head casting number as a head on an '86 TD engine.  068 103 373 D.  I do 
not know for certain that neither head was previously replaced.  I would like to 
hear more regarding this, as replacing TD heads is very pertinent to me.
Andrew