Value of unknown 400 engine.

AndyF said

I'd offer $300 unless the block was just too cherry to leave behind. You can usually tell if the block is good by just looking at it but those are rare.

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When it comes to old v8 long blocks it's about a 1-2 dollars per cid or so. Depending on what ya got.

Crank costs x 75-100?
Block costs x 200+?
Head cost x 80-100?
Rods cost x 50-100?

It adds up.