Several years ago 440source did tool and sell a water pump housing that had smaller internal passages.. I understand they did correct the tooling, and sold out the originals with smaller passages as scratch & dent inventory.. Since my primary job is sourcing electronics I have been to China >30 times puchasing signficant $$. So yes I know very well about the Chinese culture, system of subcontracting, and outsourcing for crucial materials.. The only way to guarantee acceptable end-quality is to do outgoing QA inspection and monitoring of each subcontractor, all the way up to and through mass production. For my personal Mopars, I have used the Mancini water pump housings with good sucess..
