Take it from people who have actually raced these things. Well before the Internet was ever thought of. Put the Red loctite on. Especially if you are going to push the engine at all.
Engine harmonics do bloody strange things. Nothing wrong with a little insurance.
I lost a $1,200 Tilton crank in 1977 dollars because a stupid engine builder ( not me ) used the wrong bolt on a Tilton Crank pulley. Tilton Damper had a thicker hub. Required longer bolt. Engine builder did NOT use Red Loctite. Probably would have held fine if he did.
And actually... bolts DO back out. That's wire Race cars also use Safety Wire. As do Airplanes. When your life is on the line you want to make damned sure that a critical bolt doesn't come loose from Vibration. Belts and suspenders every time.