Fastest recorded bowling speeds:
Name Speed in MPH
Raj 68
Suhas 66
Sundeep 65
Murali 64
Dimpal 62
Mayur 58
SandeepP 53
Inder 47

These were measured by an el-cheapo $100 radar gun that has a 15 ft. range. The radar device may understate the actual speed depending on the angle at which the ball comes towards it.
If a 65 mph ball comes toward it 10 degrees off the perpendicular, it will show 64 (65 * cosine(10) = 64.01)
The ball also may slow down due to wind resistance by the time it reaches close enough to be sensed. But all these reading have been taken at pretty close range, so this effect can't be a real factor.