I super-size with the guy and everything, but didn't
he get cheap heads because they were cheap? (Edit, I do not think OP said that. I miss remembered).
I mean, let's face facts: the tolerance on the volume in question is what? +/- 1cc? 5? 20?
How exact would a set of trick flow heads be? How much extra does cnc porting cost, to eliminate production variables?
Sorry, but if OP is just now figuring out that Made In China is code for 'stick it to the dumb American, that's on him. Speed costs cubic dollars, and so does going fast. Pay up or shut up.
ESPECIALLY when buying Chinesium online.
I do feel bad for OP, BUT I've learned this lesson more than once in dealing with China
