[Walt Fricke]

Flo - I agree that for a stock 6 bolt flywheel engine, the factory specs are perfectly adequate as to torque, and don't need a thread locker. The same is true for the 9 bolt later cars. I race one of those in a stock class, I rebuilt the 3.0 motor to stock specs, and it has had no problems with the flywheel coming loose.

However, the Porsche factory specifications are unquestionably inadequate for a race motor spinning consistently over 7,000 RPM. Porsche had no end of trouble with its 2.8 RSR motors, and never actually solved the problem other than pulling the engines after every race and using new bolts.

I had two flywheels get loose on my 8,000 RPM 6 bolt race motor with the stock torque before I learned how to deal with this. After that I've never had one get loose.

Someone else with experience using a high RPM 9 bolt race motor would have to opine on what more than stock, if anything, is needed for those. The wider hub is going to give a better geometry, I suspect, although the unfortunate coincidence of a 4th order node or whatever it is with the crank right on the flywheel mating surface might still be there causing problems.