Highway Revs

Made it 45k so far.....Just stay off the highway. :)

If you keep up the maintenance like you have, it's more of a annoyance then anything else. I put quite a few miles on 4.10/4.56 gears in the 70's. All I can say is, even though you have a fairly mild cam, the valve springs will generally be the first things to let you know when it's time to look into the engine.