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how much is a fully rebuilt one worth then?
That depends on who rebuilt it and what was done to it; you really have asked a 'how long is a piece of string' question here Gary. I sank several thousands into the Quicksprint engine which was quickly undone by a low quality £10 component!
As a rough guide I'd say there were four categories:
1. A standing, non running, unknown engine: £100 tops if you find a customer. It's something someone would buy if it was close enough and they had somewhere to keep it. You see these frequently change hands on ebay for sums such as £62, £82 or if the seller is lucky £102! The less ancillaries included is what usually controls the lower sale prices.
2. An engine that can be seen and heard running, tested, but is proven to be in tired condition or needing attention: £100-£250 depending on the results of the test
3. An engine that can be seen and heard running, tested and can be proven to be in good order: £500 upwards
4. An engine which has been fully rebuilt and documented and carries a warranty from the builder would depend on what has needed to be done and what new parts it carries and to what specification. One bored out to +40 everywhere would maybe be less than one at +10, but you'd be looking at four figures as an absolute minimum for an engine without ancillaries.