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It is highly unlikely that a light impact, such as the one you describe, could damage the unit. The 185-190 numbers seem reasonable. Also, before you decide to take some sleeping pills and go walking into the Gulf, the Helms manual says that a nominal measurement for compression would be 180 psi. The lower threshhold is 135 ( I believe - I looked it up earlier this week). Those compression numbers don't seem bad.
Just thought of this. Have you had any work done on your cooling system recently? Radiator replacement, coolant flush, heater core replacement, etc? You may have an abnormal amount of air in the cooling system that is trying to work it's way out. You may want to open the radiator cap (when engine is cold), start the car and let it start to warm up. It may begin to spit bubbles out and suck down the water level. Keep adding coolant until the level doesn't go down at all. Be sure to do this until the thermostat opens up completely (engine reaches operating temp).
Perhaps this will solve your problem. Keep us posted.
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