casing material still in the head

[YELLOWSS]

mercury heads.
i bought a set of used heads form a guy on here. i heard a rattle in one of the heads. tried shaking it out. didn't work. so i took a small cable ran it up through the water jacket. all kinds of black crap came out. little pieces. then i hit the big chunks. it looked liked burnt sand. i figure it is the casting material when they made the heads. only on one side of the head.. somebody wasen't getting proper cooling. mercury's finest!!! anybody ever seen this before???

roy

[Hottrucks]

or it came out of a mud sucking bass boat??? let see a pic

[RIVERRUMMER 70]

or it came out of a mud sucking bass boat??? let see a pic
MOST LIKELY WHAT YOU HAVE FOUND!
AND WHY THE HEADS WERE SOLD.
I WOULD BET YOUR LIFE THEY OVERHEATED !:D
ANY MARKS, NICKS, IN THE COMBUSTION CHAMBERS???

[YELLOWSS]

no marks but they have been milled to 26 cc. i talked to the seller and the motor was locked up!!!.
i will post pics of the junk on mon or tues. going out of town for the weekend.

roy