What engine is this?

There are online mower parts dealers who could look up what engines would simply bolt in.

Several years ago I installed a replacement engine into my 2005 Sears Craftman LT1000, bought it online and it bolted right in. I'd been having starting/cranking issues on that original engine (even after adjusting valves, keeping battery on trickle charger), must've had an oil leak while mowing and lost the engine. A bonus is that my replacement one has a few more hp and has an real spin-on oil filter.
 
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