I think every type of swap has potential issues, regardless of who made the engine. Any time you start monkeying with the original design of the vehicle, you're at the mercy of the makers of the aftermarket crap AND the installer to ensure reliability and good performance.
- I've heard of heat management issues on both hemi and ls swaps, from overheating to radiator failures.
- Communication issues with LS, inferior transmissions with hemi.
- Both setups need to be tuned, no matter what a kit supplier may advertise.
So far, my hemi swap issues have been minor, and no problem has been insurmountable. Not sure I'd be able to say the same for an LS swap, say, if the comm. module between mopar and GM systems failed. But then again, my Mopar PCM could fail and then I'd be out several hundred bucks and several days with no way to fix it on my own.
So anyone who says "LS is the only choice hands-down" or "Mopar or no car" is a little full of shit, IMHO. I'd say they're both fairly equally good but equally quirky overall. For best results, the owner needs to be prepared to attack the quirks as they appear.
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