I spent some more time preparing firewall parts tonight. First I prepared a doubler that reinforces the firewall where the brake lines will go through.
I marked the centerlines then taped it in place.
After I flipped the firewall over, I matchdrilled the plate to the firewall.
I supported it with a piece of wood while drilling..
After deburring the plate, I marked and drilled the two holes for the brake lines.
..dipped some cutting lubricant on them.
…then enlarged them to 7/16″ using my unibit at low speed.
After that I matchdrilled everything, also the firewall recess.
I also cut this hole…
For the brake fluid resevoir.
Everything is now matchdrilled.
Finally I started countersinking the parts that will mate the firewall dimples. Almost done..