Honest answer? If you have 1/2" movement the main journals are likely all trashed as is the crank. Then you have the connecting rods holding the crank in place by the pistons and cylinder walls. The damage could be massive.
Or, if you are lots luckier than I am the block is fine and you just need new bearings..
Pull the pan off and look.
Or, if you are lots luckier than I am the block is fine and you just need new bearings..
Pull the pan off and look.