red line of motor

I have a 2005 (LS2) with a manual transmission and Z51 track package. I have installed a Vararam CAI and Flow Master Mufflers. That's it ... no other bolt-ons or internal work. Stock. 40K miles. I do not drag race. But I do track the car on road courses like VIR. Now the questions. 1) What is...

Here's a question for your engineers. How does a engine builder figure out what a engines red line is? For example: A engine builder is making a brand new custom high performance motor for a client, how do they figure what the red line is of that motor??