| :high compression plus a turbo = more power than low compression w a turbo You mean high compression plus a turbo= more problems than a low compression with a turbo. They spent all that money engineering a different version of the engine for a reason. If there was a benefit to use the NA block, Nissan would have saved the money and just used that one. But you're going to run into detonation problems and reliability problems using an NA block. Think about it- on the NA version, if there was that much headroom to raise the cylinder pressure, they would have just used a higher CR on the NA engine. They didn't because they'd experience detonation on pump gas. When you go forced induction, you have to lower the compression.
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