The oil pan is back from the machine shop.  They only charged $80 for machining the flange flat.  I hate oil leaks and I am sure it was worth the effort and money.

I have a long list of things to do from painting the engine accessory case to mounting ground blocks before I can put the engine back on the firewall.  It was really to my advantage to take the engine off the plane (took less than 1 hr) to gain access to the firewall and the front of the engine. 

This shows the firewall through bushings I made and installed.  Since they are high temp fiberglass products, they are floxed into the firewall.  They are nicely rounded on each end to prevent chafing of the wires and possible contact with the grounded firewall.    The starter cable has over 600 amps flowing through it and I want to make sure there is no possible way to contact the firewall, ground out, and start a fire. 

The bushings are 1″ long with a 1/2″ flange exposure into the engine compartment so I can put firestop on the end. In the unlikely event of an engine fire, the firestop will prevent fire/smoke from entering the cabin from the wire openings.