Does this sound right?

[sneakyfast]

Guys....let me apologize in advance for the dumb question as I am relatively new to the old and performance truck game.

I have a 1973 with a 383 stroker engine at the mechanics getting some carburetor work done. The mechanic sounds pretty knowledgeable about them but he made a comment to me that didn't sound right.

I told him that I recently was on the interstate and at those speeds was running around 3900 - 4000 rpm. He mentioned that I would damage the motor if I had any sustained running of the engine above 3200 rpm. He said no problem blasting up to 6000 rpm but that the problem was that sustained rpm.

Does that sound right? I have never heard of any engine that was below red line having damage due to sustained rpm.