philbey, you raise some valid points,
however,
use genuine parts!!!
just any high tensile bolts aren't necessarily going to cut it. (some aftermarket ones will suffice, but check all specs carefully)
you need to know the tension/torque that is to be applied to them as per the factory settings, and many 8.8 high tensile bolts are not up to the task.
i agree with the idea of replacing them if they are in the state shown,
but be very careful when giving advice out on a forum where it could be misinterpreted.
as far as flex plate bolts being under more or less strain??? what is your evidence to support this?
i can appreciate you trying to make people's car's safer, but please be careful when you give advice that is unfounded.
the bolts that you have shown are highly fatigued and should be replaced, but i don't necessarily agree with just going down to Coventry's and buying high tensile bolts.
I sell the same bolts at my work that they do, and we refuse to sell any bolts for flywheel applications, as the manufactureres specs are very specific, and we won't risk people's safety or a lawsuit for the sake of a few bucks.
and Trev, i agree with the use of plain shanked bolts. they are stronger through the plain shank area as there is no reduction in diameter for the thread.
in all modifications please take care.
sorry to rant on, but this is very important, and anybody is free to give an opinion or tell me i'm wrong, but i want to see evidence.
that's my 2c.
-dave