I keep breaking rocker arm bolts, help please!
DON'T OIL THE BOLTS!!!
Run a tap in the hole for the bolts, then run a die down the bolts so you have clean threads in both the hole and on the bolt.
then run them down DRY.
80% of the torque for a joint is from the friction on the threads. By spraying them with oil, you are reducing the friction greatly. So for the same torque, you are getting much more "clamp" because you are stretching the bolt more per unit of torque with them "wet" vs "dry".
In simple lay-man's terms. By oiling them, you are reducing the friction on the surfaces so much that you're overstretching the bolts (for that torque).