Exactly guys!!!
I've read a lot of posts regarding hardware over the past 6 months.
There have been a lot of thoughts, and theories, thrown about regarding proper hardware. It's a shame really; because it leads to a lot of confusion for those who are new.
There is the thought that that you don't want to use bolts, (instead of studs), because constantly running bolts in and out of Aluminum will wear out the threads. I have to ask: how often do you remove your intake or exhaust manifolds? How often do you remove the engine mounts? I have shop fixtures made from Aluminum that get fasteners removed and replaced many times per hour!!! Amazingly they still work, after 6 months use. Sure, it's true, the fixtures are made from from 6061-T6 mill material, and the engines are cast. With that said, the engine will be ready for the scrap heap long before you wear out the threads.
Then there's the Stainless thought! I'm not sure where this came from; but unless you have access to heat treated aerospace/military spec stainless fasteners...stainless IS NOT the way to go! Stainless all-thread would be almost as bad as what the Chinese supply as far as this application is concerned, especially for the engine mounts.
The grade 5 vs. grade 8 thought! Grade 8 hardware IS NOT so brittle that you're bike will fall apart due to fastener failure...In fact the opposite is true. Grade 8 fasteners are made from Chromoly, (4130, 4140), they are heat treated to 44-48 on the Rockwell "C" scale. Grade 8 fasteners are tough not brittle!
Grade 8 allen cap screws are the only way to go as far as fasteners for these engines are concerned.
Jim