I have never heard of anyone bragging about what a great B&S engine they have, they just seem like an economical brand name. Also, I would not use an Aluminum air cooled engine on a garden tractor that is as "well enclosed" as the 782 They need to breath lots of cool air. Unless the ducting was done VERY WELL (never is) the engine will be a lot more prone to overheating than the factory one. Personally, I would pass.
Someone told me something once about engines and garden tractors/mowers, one of those quick reference things, to the effect of: lawn mowers and lawn tractors have aluminum engines, but garden tractors and larger have iron blocks.
I believe the reasoning has to do with how they handle heat stress, from really working the engine the way you do with ground engaging equipment. Seems pretty reasonable to me.
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