Ok, is it possible to engage in vigorous physical activity with bad heart valve and or aortic aneurysm without experiencing symptoms?

No: It is very important to talk in depth with your cardiologist about what exercises are allowed if any considering the severity of your heart condition. It is possible that without speaking to him/her the first symptom may be death.

Not likely: The cardiac valve problem, especially aortic or mitral, will cause shortness of breath issues which would make it unlikely to continue what your were doing. The aortic aneurysm would have little to no symptoms with activity. Doesn't mean that the aneurysm can't rupture, in which case your symptoms would be pain and likely death. Very unlikely to happen unless the aneurysm is greater than 5 cm.