BlockDock™ strong 1/2-inch thick billet aluminum adapter provides secure mounting of your Mopar small/big block or Hemi engine to your engine stand, Bellhousing bolt pattern provides exact fitment to LA and B/RB Mopar engines and can be used for both early or late Hemi mounting as well, SAE hardware with 1.8-inch thick spacers provided to mount adapter to Mopar engines with flexplate/flywheel in place, Threaded holes on adapter allow for on board storage of fasteners and spacers to prevent loss, Designed to fit standard four ear adjustable engine stand heads (after removing adjustable ears).