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Will a Chevy 572 big block fit in 1980 firebird?

Fitting a Chevy 572 big-block into a 1980 Firebird is highly unlikely without significant modifications. The 572 is a massive engine, and the Firebird's engine bay, even with a 400 cubic inch engine, is relatively compact.

You'd face numerous challenges:

* Engine Bay Clearance: The 572's size and bulk will likely interfere with the firewall, frame rails, and various components within the engine bay. Extensive modifications, potentially including firewall modifications, would be necessary.

* Exhaust System: Finding a suitable exhaust system would be a major hurdle. The headers and exhaust routing would need custom fabrication.

* Transmission: The transmission and associated components (driveshaft, etc.) would need to be compatible with the 572's torque and power output. A beefed-up transmission and possibly a custom driveshaft would be required.

* Suspension: The increased weight of the 572 would put extra stress on the suspension, potentially necessitating upgrades to handle the power and weight.

* Cooling: Proper cooling of a 572 is critical. You'd likely need a large-capacity radiator and possibly an upgraded cooling system.

In short, while *theoretically* possible with extensive fabrication and custom work, it's a very difficult and expensive undertaking. It's far more realistic to consider smaller big-block options (like a 454) or even a smaller, more easily-installed LS-series engine for a similar power output with less modification hassle.