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I'll take a poke at it but someone please correct me if I am wrong. Adjustable cam gears change when the valves open and close in relation to combustion and piston position. This change in valve timing can yeild more horsepower because it changes when and how much air/fuel exits or enters the cylinders. Vtec controllers on the other hand don't directly control valve timing but they control when the ECU switches from low-throttle settings to high-throttle settings. Cam gears would still affect both settings throughout the entire RPM range.
 

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They are not that tough to install. Mine were put in when I knew nothing about Supras but I helped out the guy who did it. It seemed easy the way he installed them, he didn't even take off the timing belt. Just make sure you get the belt on the right teeth in the end. :)
 

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They are adjusted by loosening the inner bolts on the gears. This way you can keep them on the same tooth of the belt but slightly alter when they tell the valves to open and close. It is very simple to adjust them, especially if you keep your spark plug cover off.
 

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What makes you positive of it? I've heard time and time again from knowledgable people and VERY RELIABLE sites such as MKIV.com that it is non-interference.
 
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