Turbo install valley pan drain holes/firewall questions

[IDIBRONCO]

If oil isn't leaking out of the grommet around the drain back, then it's fine and shouldn't leak at all. If your cab mounts are worn, that's when you have the most trouble with the downpipe installation. I was installing these engines for a living so it wasn't my place to do anything extra to these trucks. On the other hand, I didn't have to modify very many firewalls.