Flywheel to crank bolt size

the original mopar ones will have a cut under the head only the outer 60% of the head presses on the flywheel

presume this is an anti- come undone- feature. but i dunno. really

same tension in bolt applied by only the outer 60% of the bolt head = much higher friction between bolt head and flywheel therefore less likely to come undone. is what i was told

it seems similar to something i have heard about called a Cosworth ring..
in that case you scribe a circle through the flywheel bolt holes then use a lathe or mill to cut a a narrow very shallow groove following your circle, which in theory does much the same. i.e the bolt head surface area touching the flywheel is reduced due to the small trench you just cut in it, but the torque you apply is much the same hence the friction between bolt head and the flywheel increases.

could all be horse doo-doo

seems to make general sense, but i don't know enough about pressure, friction and the impact of the properties of differing materials to know.

I'm using chrysler bolts they seem to work well enough for my standard ish type use


Dave