Value of engine upgrade?

[thstone]

Most buyers don't want to inherit someone else's problems and buying a FrankenMonster sets off just about every alarm under the sun. Even the most tasteful and professionally done engine upgrades often don't turn out well or have significant compromises (in the long-term).

I'm not saying that it can't be done right (it can), but so often it isn't and distinguishing between the two can be hard for most buyers.

Therefore, there isn't much demand and not much of a premium in the pricing.