Can anyone explain why all the intake ports have a bronze sheen or stain except #7, the one that leaked the most oil. You can spot it in the first pic as it is the one with the puddle of oil? Reversion, but why not #7?
This may be a stretch, but maybe the excess oil coated the intake not allowing the carbon to stick, except for the hot intake valve which carboned up?
Do you have flow sheets for those heads, they look like they could use more porting.
