Leaving all those ribs behind, it was time to tackle the firewall. The firewall is the barrier between the cockpit and the engine. Thus, it basically needs to be sealed off from whatever messy stuff the engine emits like oil and exhaust. Yes, this means the return of proseal.

There were not many parts in this section. It was mostly the firewall itself, some structural doubler pieces, and “tunnel sides” that go over the muffler shroud and also are immediately inside next to where my feet will go.

Yes, you see nitrile gloves and proseal. All seams in the firewall pieces have a proseal seam to seal the pieces together.

This is looking on the engine side of the firewall. The engine frame gets attached here, and that is part of the reason for the structural pieces riveted to the other side.