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Message: <blockquote data-quote="Shocker98GT" data-source="post: 400028" data-attributes="member: 9697">Well really the big killer of the 4V in these situations is the very high factory redline, or at least even with a power adder, your desire to USE that factory redline. You have a 7000rpm redline, and remember that inertia loads on the bearings, rods and pistons increase with the square of RPM. So say the crankshaft speed increases by a factor of 3, the load is actually 9x greater. That's the reason engines don't blow at 2000rpm even with a supercharger, they blow near redline. That's also why the centrifugal supporters "having high boost and low RPM could damage the engine" argument isn't valid. This engine is hard to intercool for a positive displacement application due to the sheer size of it, so the KB kit is non-intercooled and lower boost compared to say a 99-up PI gt. The tune is also more conservative to stave off detonation, another reason it doesn't make super high power numbers (considering the flow of the heads, anyway). Personally, when people are worried about pistons and rods, I think turbo is the best option. You can run less boost to get your desired power output, and because you're running less boost you also don't strain the fuel system as much, you also strain the engine less on top of removing the load that a supercharger presents to the crank.</blockquote>