On my current bench, and my previous bench...... in equal condition...... X heads outflow J heads.
And with equal amounts of porting, the
X heads still outflow the J heads.
The X heads have a superior intake floor and SSR.
They are not “the same” heads.
Taking one of each in ootb form, by running my finger down over the intake SSR from the bowl side, I could easily tell which was which....... while blindfolded.
