Challenges and Necessary Modifications:
* Engine Mounts: The LS engine's mounting points are entirely different from the V6. You'll need custom motor mounts, likely fabricated or purchased from a specialized vendor.
* Transmission: The V6 likely uses a different transmission than the LS engine. You'll need to source a compatible transmission (likely a T56 manual or 4L60E automatic), along with the necessary adapter plates or bellhousing if the transmission isn't a direct fit.
* Wiring Harness: The wiring harness for the V6 is completely incompatible with an LS engine. You'll need a new LS wiring harness, or you'll have to rewire significant portions of the car yourself, which requires extensive electrical knowledge. Many opt for a standalone engine management system (EMS) like Holley EFI or similar to simplify this.
* Exhaust System: The exhaust manifolds and piping will need to be completely replaced to accommodate the LS engine's configuration. Custom fabrication is likely needed.
* Cooling System: The LS cooling system may require modifications or replacements to properly integrate with the Camaro's existing cooling system components. Radiator size and capacity might need upgrades.
* Fuel System: The fuel system may need upgrades to handle the increased fuel flow demands of an LS engine.
* Computer/ECU: The stock V6 computer will not work with the LS engine. You'll need an LS engine computer (PCM) or a standalone EMS.
* Driveshaft: Depending on the transmission choice, the driveshaft might need to be shortened or lengthened to fit properly.
* Brakes: The LS engine's increased power might require upgrading the brakes to handle the additional stopping power needed.
* Body Modifications: In some cases, minor body modifications may be necessary to accommodate the larger engine or its accessories.
In short: While possible, an LS swap in a 99 Camaro V6 is a complex project requiring mechanical expertise, specialized tools, and a significant financial investment. It's not a weekend project; expect to spend many weeks, or even months, completing the swap. Many individuals find it easier and more cost-effective to purchase a Camaro that already has the desired LS engine.
