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I'm just wondering since it doesn't say so. I've never dealt with SGP, and don't know much about building a VG30, but if they ground the numbers, maybe they did the porting as well. It sounds like if they just threw on NA heads with out doing the porting, changing the valves, springs, and guides, that the heads wouldn't support the kind of pressure needed with high boost. More facts about the motor would help.
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