If you have a lot of pec muscles will a Gyno surgery still be available?

As a bodybuilder, I operate on bodybuilders frequently, and muscularity does not impede the ability to perform surgery.Find a board certified plastic surgeon who performs hundreds
of body contouring procedures and male breast reductions each year.
Then look at the plastic surgeon's website before and after photo
galleries to get a sense of who can deliver the results. Kenneth Hughes, MD Los Angeles, CA

Good definition of the Pectoralis muscles does not pose a problem from getting successful gynecomastia surgery. The muscle should not be damaged or affected. Good luck.

Be sure you talk to a board certified plastic surgeon, you need to see before and after pictures, if you are a competitive  body builder, most likely you will need resection (surgery) of the glandular tissue. The breast tissue lays on top of the muscle, because of that it does not matter if you have little or a lot of muscle mass.