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That's what I suspected. I think you have valvetrain instability that is limiting your rpm. I also think the cam is too big for that compression ratio. You need cylinder pressure and the only way to get it is with more compression or a smaller cam. Advancing the cam will help too, but it will take away from the top end. A cam about 15-20 degrees smaller and correct the valvetrain issues, and it will be a totally different animal.

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I'll bite, how did you determine that already? What's your recommendation for repair? How much is it going to cost me? Is it guaranteed to make my car faster?