A larger inlet valve will most certainly make it's presence known, state of tune
notwithstanding. You'll see a definite improvement in the torque portion of
whatever cam profile you are using.
"Reversion" in airflow using the stock cam profile is minimal so Rimflow valves
designed specifically to combat same would be a waste of money despite their
excellent
quality.
However, as cam timing approaches durations of 270 degrees or so, they become a
definite asset in helping to maintain smooth airflow to aid low rpm torque,
normally lost to one extent or another with more "hairy" cam profiles as you
get into the Kent 276, APT SPVP3 range
Cap'n. Bob '60 :{)
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