I’d love to see a dyno test, for any make of motor, that saw any kind of real power gain, where the only change was the exhaust rocker ratio....... in a combo where the exhaust port wasn’t just horrible(relative to the intake port), or way too good for the application......... and the cam wasn’t just flat out wrong for the combo.

In other words....... nothing appears out of place or way off for the combo...... you do nothing but swap the ex rocker ratio...... and see a worthwhile improvement.