High-Performance Options (More Complex, Higher Cost):
* LS-series Chevrolet V8 (LS1, LS2, LS3, etc.): This is extremely popular. These engines offer incredible power and reliability, but require significant fabrication and modifications to the Fiero's chassis. You'll need custom mounts, wiring harnesses, and potentially a strengthened frame to handle the increased power and weight.
* Small-Block Chevrolet V8 (SBC): A classic choice, but also requires substantial fabrication. While less powerful than LS engines in general, many variations are available for tuning and modification.
* Audi 5-cylinder Turbo: These offer impressive torque and can be relatively easy to fit, though finding one in good condition and adapting it can be a challenge.
More Moderate Options (Less Complex, Lower Cost, but less power):
* Honda K-series (K20, K24): These are popular in swaps due to their relatively compact size, high revving nature, and availability of performance parts. They still require significant modifications but are a less extreme undertaking than a V8.
* Mazda Miata 1.8L or 2.0L: A relatively straightforward swap, requiring less fabrication, offering decent power and reliability. Still, modifications will be required.
Things to Consider:
* Weight Distribution: The Fiero's relatively lightweight nature is a benefit, but adding a heavier engine can negatively impact handling. Careful consideration of weight balance is essential.
* Cooling: High-performance engines generate significantly more heat. You'll likely need a more robust cooling system.
* Transmission: The Fiero's stock transmission may not be able to handle the increased power of many of these engine swaps. An upgrade may be necessary.
* Cost: The cost of the engine itself is just the beginning. Consider the cost of fabrication, parts, labor, and professional tuning.
* Legal Issues: Engine swaps may affect your vehicle's registration and insurance. Check with your local DMV.
In summary, while the LS-series V8 is frequently touted as the ultimate performance upgrade, it's a significant undertaking. The "best" engine really depends on your experience, resources, and goals. Start by researching specific engine swaps and reading forums dedicated to Fiero modifications to get a better understanding of the challenges and rewards involved.
