Evo, is right here.
Moto engines are really appealing especially the 250s(because they focus alot more towards FE than the big L4s). IT would seem that the moto engine would be cheaper. . .but they really aren't.
Motorcycles have virtually no features that make automobiles expensive(which makes it bizarre that any of them go for more than 5-6K. . .). Its actually not the features that make them expensive. . .its just the number of features and making everything fit together correctly in a very small space.
Also if you buy a complete block it comes with an AC compressor new most of the time which you can turn and sell on ebay for 150+ to recover cost(new compressors go for 300 of the shelf). Also you can sell the exhaust manifolds and a few other bits and pieces to make it cheaper.
Keep in mind motorcycles are considered high mileage with 20K miles(not that they will fall apart then). High mileage for a car is 100K(200K for Honda's ^_^), so if you are going to build something do you really wanna risk having to redo it in 4-5 years?
Also a note to anyone considering. Make your engine bay spacious. Leave ample room around the parts. If you have to take it to a mechanic they will charge you less if its very easy to access everything(it takes far less time and its far less frustrating). It also makes it much easier to maintenance almsot everything yourself if you have room(otherwise you'll need to disassemble 3-4 pieces to get at what you want and then its mechanic land).
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