Ok this is my first time so plase bear with me. I have a 200 Chevy Impala 3.4, 55,000 miles. Recently had manifold gaskets reaplced, followed by the water pump, and NOW the Head Gaskets need to be replaced (all within 3 months) Is this NORMAL?

i would say no, since this is the first tiem i have ever seen that stuff needed replace at the same time here, and also ours has the same mileage (02') and it has none of these problems.