I have an inline VW motor (ABA Jetta block) with a couple of the exhaust
manifold studs missing.  This motor is in my van using the diesel factory
parts from the diesel Vans...50 degrees laid over.   I can get to all but
two of  the exhaust manifold studs with box wrenches, but the two in the
central cylinders I can only reach with multiple extensions and deep
sockets while the motor is in the van....So...When I try to install those
two central studs....It don't woik!    I've been counter-tightening two of
the nuts, then running the stud down into the head, but I can't make it get
tight...the two nuts will work down the stud and the threads on the stud
won't thread far enough into the block to hold well...I have plenty of
spare studs and nuts to work with from my cross flow extra head....I need a
work around.   I don't fancy pulling the motor for this....

  any ideas?   (besides pulling the motor and doing it right?)

don hanson