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Depending on your current modifications, you may not see any gains by having your manifold ported. AI (who knows a thing or two about LT1s) told me that the performance difference is negligible from stock to ported, since the stock one flows so well. If you wanted to open it up to a 58mm, that's all fine and good but anything past that might not really matter.
Having said that, I had AI port mine anyway because I have a 575fwhp motor.
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