Why the /6

CultClassik said

To each his or her own, but there's absolutely no valid reason to keep it once it dies. I'm guessing that you can replace a /6 with a 318 or 360 for around the same price as rebuilding the /6. To me, different isn't good if it's not at least as good as what's more common.

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But it costs a lot more in other upgrades to add the V8. It's not just the engine itself that needs to be swapped. It can be quite an expensive swap. Not to mention that you can often get another good running /6 for free or close to it, pop it in to replace the bad one, and you're done. Much easier and cheaper than a V8 swap.