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Old Jan 27, 2013, 02:10 PM
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United States, CT, Killingworth
Joined Dec 2005
2,040 Posts
Hangar 9 Corsair 60

http://www.hangar-9.com/ProdInfo/Fil...575-manual.pdf

The oval holes in the firewall are to allow the engine mount to accommodate multiple engine size and case widths. Adjust the mount location so you see equal amounts of the oval holes peeking out from the mounts and tighten the mounting bolts. If you're a little off, you'll never notice it.

My assumption is the lines on the firewall are either center or thrust lines.
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