Alex, there are people running big numbers with no special bolts or dowels with no problems,
its not the end of the world if they shear clean, which i have had happen in rallycross, it does no damage if the flywheel stays on the crank, the clutch keeps it in position, just new bolts and away you go, but if they just come loose and rattle the flywheel, it can kill the crank. so it wont hurt to use good bolts in reamed flywheel holes, torqued to 90 ft/lb, i do use dowels, i do them 4 x 3/4" length x 8mm, and one x 3/4" length x 11/16" to register the flywheel.
