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Single plug and stock compression ratio are not the limitation factors of RPM. The first limit is the valve springs and rod bolts. The second is the rods. Your engine can safely turn 7200 RPM with stiffer valve springs and aftermarket rod bolts(IMO). You'll be well past your power band however with your cams. To go higher on RPM you will need to go with titanium rods.
-Andy
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72 Carrera RS replica, Spec 911 racer
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