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I must ask, what is so bad with 2650 as a max rpm? Why is this a fault? You need to draw the line somewhere.

Consider this if your going to compare tractor puller's engines. They run for about 5-10 seconds at full throttle/full load. 10-15 pulls a year. That's full power for 2.5 minutes/year. And they do blow eventually.

:roll: My urologist said the same exact thing... :oops:

Now to solve the problem why my Cummins NHC-250 only revs to 2100 rpm .:lol:

I never meant to imply that the rod bolts were getting weaker with age(as the root cause of the failures). I was only making a generalized statement. At this point in the thread, I am wondering if the OP realizes that the trucks have a governor.

All metal fatigues and changes with age.

Let's not forget these engines are 20- 40 years old and obsolete for a reason. Time takes it's toll on all things, including bolts under tension.