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You could rip off an vvt system from another car and rig it to your own. This would involve a lot of machining work and electronics and programming. It would be a huge job, but it could be done if you had the time and money.
I have seen another simpler (still not simple) system that used a mechanical system instead of electronic. It used weights that would alter cam timing based ONLY on engine rpm. As the camshaft spun faster, the weights (which are on springs) pulled and advanced cam timing. This is a bit less useful as it doesn't incorporate engine load, but is probably a lot easier to implement.
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