Engine & Transmission:
* Engine: The most obvious change is the engine itself. You'll need a suitable V8 from a compatible year Firebird or other GM vehicle. Popular choices often include the LT1 (common in 93-97 Firebirds), LS1 (from later models), or other GM performance V8s. The year of the donor engine will influence compatibility with other components.
* Transmission: The V6 likely uses a different transmission than a V8. You'll need the correct V8-compatible automatic (e.g., 4L60E) or manual transmission (e.g., T56), including the bellhousing, torque converter (for automatic), and associated components.
* Engine Mounts: The V8 engine mounts will be different and must be sourced to fit the V8 in the chassis.
* Wiring Harness: The V6's wiring harness will be incompatible. You'll need a wiring harness from a V8 Firebird, or significant modification will be necessary to adapt the existing harness, including the computer (PCM/ECM). This is often the most challenging aspect of the conversion.
* Computer (PCM/ECM): You'll need the correct PCM or ECM for the chosen V8 engine and transmission. This controls engine functions and must be properly programmed and calibrated.
Drivetrain:
* Driveshaft: The V8 will likely require a different driveshaft length to match the transmission and rear differential.
* Rear Differential: While the rear end *might* work, a stronger differential designed for a V8 is often recommended.
* Exhaust System: The V6 exhaust system will not fit a V8. A new exhaust system will be needed.
Cooling System:
* Radiator: A larger capacity radiator may be needed to handle the increased heat output of the V8.
* Cooling Fans: Possibly more powerful cooling fans.
Other Potential Modifications:
* Brakes: Upgraded brakes might be necessary for better stopping power with the added weight and power of the V8.
* Suspension: Performance suspension upgrades may be desirable to handle the increased power.
* Fuel System: The fuel pump and fuel lines may need upgrading to supply the V8's increased fuel demands. The fuel pressure regulator will need attention.
* Gauges: You'll need the correct gauges to monitor the V8's parameters, such as oil pressure, water temperature, and possibly others.
In short: This is not a simple bolt-on swap. It's a major project requiring mechanical expertise, specialized tools, and a significant investment of time and money. If you lack extensive automotive experience, it's strongly recommended to seek help from experienced mechanics or professionals specializing in engine swaps. Consider the cost of parts, labor, and potential unforeseen complications before starting.
