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Pretty hard...the biggest possible stock engines in these cars are the 3.0L V6 and even with that the engine bay space is pretty limited. In contrast, a 454 is a V8 (so one cylinder pair longer) and in liters it's equivilant to around 7.4. That means that you're not only adding 2 more cylinders but also making all 8 over twice as big! All in all, you would have to knock out the firewall, take out the center console, and basically use the transmission as an arm rest in order to make it work.

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11y ago
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Q: How hard would it be to drop a 454 chevy big block be in a 1988 Nissan z31?
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