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The limiting factor is the valve train. There might be different seat pressures for the valve springs but if it was built with the specs for a 2.7 RS or 2.4 E or S engine then you can safely rev it to the 7000 limit for the 2.4 E. Check with your head rebuilder to see what spec. he set the spring heights to.
-Andy
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72 Carrera RS replica, Spec 911 racer
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