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pull valve covers and check for a very lose rocker.
sorry, I think the chain cover is a waste of time at this point. If it did jump time, which I would be curious how often this actually happens, you cant tell unless you actually check timing with the dial gauge and you cant rotate the crank enough to really do anything.
you might try putting something down #5 and turn the crank to see if the piston is still connected to the rod.
45 degrees? thats not very far. one valve would have to be pretty far down in there for only 45 degrees or you have multiple valves bent
my bet is an over rev.
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