Pushrod ?

Piston is running away from the opening intake valve. Piston is going towards the open exhaust valve. So “usually” if a valve hits its the exhaust. You can just try to bleed down the hydr lifter so it is bottomed out then adjust to zero lash or get a solid lifter. You definitely need to be able to visualize what is going on and pay attention to the details, but it can be done.