Here's a breakdown of what you need to consider:
Pros:
* Power Increase: The 3800 provides a substantial increase in horsepower and torque compared to the Fiero's Iron Duke or 2.8L V6.
* Relatively Common Swap: Many resources, kits, and experienced individuals are available to assist with the process.
* Availability of Parts: Parts for the 3800 are readily available and relatively inexpensive.
Cons:
* Weight: The 3800 is a heavier engine than the original Fiero engines, which can impact handling and require suspension modifications.
* Size: The 3800 is physically larger and may require significant modifications to the Fiero's engine bay, including possibly firewall modifications.
* Complexity: While common, it's not a simple bolt-in swap. Expect significant fabrication and custom work, including custom mounts, exhaust, and potentially wiring harnesses.
* Cooling: Adequate cooling is crucial, especially with the added heat generated by the larger engine. You'll likely need an upgraded cooling system.
What you'll need:
* Engine and Transmission: A 3800 Series I engine and a compatible transmission (many options exist, including various automatics and manuals).
* Engine Mounts: Custom engine mounts are essential. Pre-made kits are available, but often require adjustments.
* Exhaust System: A custom exhaust system will be needed.
* Wiring Harness: Adapting the 3800's wiring to the Fiero's system will be necessary. Harness adapters or custom fabrication are common approaches.
* Cooling System: An upgraded radiator, hoses, and possibly an electric fan setup might be necessary.
* Driveshaft: A custom or modified driveshaft will likely be required.
* Transmission Mount: You'll need a suitable transmission mount.
* Possibly other modifications: Brakes, suspension upgrades (to handle the extra weight), and potentially modifications to the firewall and body might be necessary depending on the specifics of the swap.
In summary: Swapping a 3800 Series I into a Fiero is a significant undertaking requiring mechanical skills, fabrication abilities, and a willingness to tackle a challenging project. While achievable and popular, it's not a straightforward plug-and-play process. Thorough research and planning are essential before starting. Consider seeking help from experienced Fiero enthusiasts or mechanics familiar with this specific swap.
