Well I found me oil return flange going to the front cover was not tight so I gave the top bolt a twist and it instantly let loose (stripped). It is not leaking too much but want to consult with anyone that has been down this road before I pull the bolt out, and can't get one back in.

I have never seen the back of a front cover and I am wondering how deep, and how thick the bolt hole is on the front cover and what size bolt I could safely tap in to replace the stripped threads.

I have put way to much work in this car in the last month and want to keep this job as quick and painless as possible.

so suggestions?