SFI Approved Flexplate works with 6 bolt convertor 4L80E/4L-85, 168 teeth, internal balance for Chevy small block/big block V8 (except external balance). 90 degree V6, inclusive for 8.1L big block 168 teeth, .187 inch thick core. High HP design with 2 piece rear seal and 7/16 inches torque convertor bolts for internal balance. Will fit the 6 bolt 4L80E and 4-L85 converter.