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Larry,

Sorry I can't make that measurement for you since my engine is a different
model.  But here's a tip that I wish that I had when I was building.  Orin
told me about this when he did my first flight.

Install a large area washer between the top vibration dampeners and the
engine.  Do your cowl installation in the normal fashion.  Then, when the
engine sags, its a very simple job to remove the washers and instantly raise
the engine.  Believe me that its a lot easier to do this than to install
washers in the lower dampeners or between the engine mount and the firewall.
This will take the worry out of the question of "how much will the engine
really sag?"

Later when the engine starts to droop you could make some washers out of the
extra stainless firewall material and use these to "fine tune" the position
of the engine.

Hal  N360HW

LML website:   http://www.olsusa.com/Users/Mkaye/maillist.html
Builders' Bookstore:   http://www.buildersbooks.com/lancair

Please send your photos and drawings to marvkaye@olsusa.com.