Changing the cam seals, I was tightening the bolts on the retainer. I forget the proper torque, something like 6 or 7, but using a torque wrench to set the torque, one bolt on each cam tower never reaches the set torque, they just turn. I removed the screw and looked in the bolt hole; the threads don't look bad, no aluminum filings inside and bolts do get fairly 'tight', but I'm worried that they might work loose. What should I do:
1 Tighten them as far as they will go and call it good.
2 Use some thread locker. How hot will the cam tower get when engine is running?
3 Use thread inserts.
I don't really feel like going back to the junk yard for some cam towers, and who knows they could have the same problem?