Im with these guys, there's more than just push rods doing on. With possible mis matched stuff going on the best bet would be to replace the two bent push rods. Check ratio, check for coil bind and make sure your retainer isn't hitting the valve guide.
Did you over rev the engine recently?
Are you using coolant? Hydraulic that cylinder?
7&8 are the most common to go flat. Especially if you had just replaced an intake manifold and or gasket.
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