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When I bought my car, way back when, it came with a 2.7RS spec motor. It had a power curve exactly as you stated. Great throttle response from the mechanical injection, but something was definitely missing from the top end. Not that it was slow, (I still remember pulling on one of those twin turbo Z's. The look on the guys face was priceless), but it was lacking a solid push above 5,500 RPM. It would just kind of rev in that range, not really come alive.
When it started to leak a larger than normal amount of oil due to a pulled head stud, I pulled it apart. I discovered the prior owner had taken a few short cuts to obtain "RS" spec. Apparently he just added the P/Cs and left everything else the original standard "E" spec of the core motor with the exception of "S" cams. The heads were not ported or fly cut and the injection system was standard "E".
I reasoned that was the source of my missing "spike" in the power curve above 5,500.
I have since moved on to a bigger motor, but I have all the pieces machined and waiting in the garage for assembly. I just have not had the time to confirm if my hypothesis is correct.
Tinker
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