Ampco-Pittsburgh Corporation (AP) investors have been experiencing some short-term gains from the stock of late. Shares of the Carnegie, PA-based manufacturer of highly-engineered, high-performance specialty metal products and customized industrial equipment have surged 253.9% in the past three months compared with the industry’s 18.1% rise. The stock also outperformed the sector and the S&P 500’s 18% and 1.7% gains, respectively, in the same time frame.A major development of AP in recent months includes th ...