Is it possible to lift the rear of a boat up with an engine hoist?
Be careful as U can tip the engine lift over there not made for long lifting only direct up lift.
You don't give any details as to the size of your boat, but on most small craft the stern cleats are plenty strong enough to lift the stern. If you are working under the boat, rig a secondary lift from the outdrive or the lifting rings on the engine as safety, or block the boat before getting underneath.
You can lift small boats, up to say a 19 footer. but you must use caution. Don't lift by cleats, a sling under the boat with a spreader bar over the top, is best. Make sure the hoist in well under the back and of at least 1000 lbs cap. also don't work around the boat until it's blocked up and the hoist is lowered to let the weight rest on the blocks. If your trying to remove the boat from a trailer, you need to use a different method. Use your best judgment. If your uncomfortable with what you have, don't attempt. Good Luck!