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Willie,
I can't say if the engine can be moved forward sufficiently to perform Mod 72 
while
still attached to the coolant and oil plumbing.  My engine was only about
1/2 installed when the Mod was announced and I elected to discontinue any 
further
installation work until the Mod was complete.  I completely removed the engine
to do my work.  
You will need a minimum of 20 cm, perhaps as much as 25 cm (10 inches or so) to
gain sufficient access to the frame to get the reamer and a wrench in there to
work.
Good building and great flying,
Bob Borger
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