Burgess Norton, a business unit of Amsted Industries, a global provider of precision bearing surface finishes, powder metallurgy technologies, completed the acquisition of a stake in Powertrain business of Tenneco, a global company in gasoline and diesel engine piston technologies. Financial terms were not disclosed. "Tenneco is strategically focusing their powertrain technology solutions business for growth and superior pistons are a key component of that, and Burgess Norton is targeting opportunities to expand our capacity and our global precision power transfer technologies," Luke Rubino, Burgess Norton President.