I am in the military, and we always have timed runs we have to do. I have been diagnosed with a heart murmur as a child, and I understand it is not uncommon for it to affect you while running.

My question is, is it possible to boost your run speed by having a heart murmur?

The reason I ask this, is because I am a heavier set individual. 5'9", 210 lbs.
However, I still outrun everyone I work with and time after time I receive crazy attention with my run speeds.

My recent run times:
1.5 mile= 9:01
1 mile= 4:30