We saw the Small-Block Chevrolet engine in the last WEOTD, which means it's time to take a look at what may be the only engine that can rival the Chevy in terms of longevity and units built: the air-cooled VW. In one form or another, it was manufactured for 70 years; while it had its weaknesses (feel free to list them in exhaustive detail, commenters, but don't leave out the strengths), it was a lightweight, simple powerplant that was cheap to build and easy to work on. And, just because we can, we're having a poll for your favorite! [Wikipedia]

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