Can you ride rollar coasters with a pacemaker and having aortic valve replacement?

Yes. Valve should not be an issue. The pacemaker, depending on settings, could detect the shake as arrythmia? Ask your doc to be sure of settings, and any defibrillator capacity. One may have a very good natural rhythym, and the pacemaker is backup-used infrequently more details from your doc and the device will help you!
Not concerned about. Valve replacement , however, as far a pacemaker goes want to make sure the harness is not putting pressure on pacemaker ...Talk to physician who put in pacer.