The main reasons are washers that thin will either be too soft and squeeze out or too hard(brittle) and break both conditions will cause flywheel/Flex plate to fail.
Last edited by W.I.N. racing; 07/14/1907:11 PM.
'01 P1500, Blown/Inj BAE,/Veney ,Bruno/CS2,Dana 60 '01 Dodge 3500 S Cummins Auto, Fresh air kit, 4" Exhaust, '05 Dodge Magnum R/T - Too Much to list '60 Willys CJ5 '01 International LPX - Project,DT466, Allison '64 Plymouth Valiant, Inj 528 Hemi, 2spd