brewmanbrett

BIRMAN,

The first thing I did was mount the engine to the engine mount, then draw a line down the side of the engine mount that lines up with your driveshaft. Match this line up with the horizontal factory line on your firewall.

Then measure make sure the vertical line on the firewall is directly centered between the engine mounts.

Now take a sharpie or pencil and stick it through the mounting holes on the engine mount to mark where to drill your new holes.

This method will keep the built-in right and down thrust, and keep the propeller at the centerline of the aircraft for when you mount your cowl.

You may want to put the extra firewall backing in before this step to save you drilling twice. It's a bit labor intensive, but worth it. I'll try to take some pictures for you tonight.

brewman