simple queston. does this involve the removal of the intake manifold?

 

No, valve covers are a separate part.

Depending on the Blazer it can still be a bit of a task. Lot's of hoses, wires and tubing to be removed.
Not too bad but needs a bit of a systematic approach. Pictures, drawing, stickers to what goes back to where.

 

perfect. just didn't wanna get to involved in tearing apart an engine. if it were the case I would work on the intake as well as the valve covers