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For a stock cam setup that's still NA, it's not worth it. The cathedral port 102 actually works on the LS2 cars, but the LS3 cars don't leave much to be gained.
I'm only doing a FAST 102 on my cammed LS7 to try and inch over 600whp... it's ultimately not a mod that's "money well spent" unless you're really trying to squeeze everything from a setup. If you are seeing your manifold pressure drop more than 1-2 kPa during wide open throttle, then you could probably benefit from the larger plenum volume.
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