I posted this initially in the general tech forum but didnt get alot of response so I am trying it here since you all deal with aluminum heads more frequently.
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I have recently aquired a set of M&A heads. Upon pressure testing it was clear that they have a porousity problem. there is a total of 6 leaks between the two heads. All but one of the leaks are external with the one leaking under the valve cover. All of the leaks have been attemted to be repaired by a previous owner via either welding or apoxy unsuccesfully. I have heard about GM tablet sealer, Irontite and K&W sealer which all would be done after install. A freind mentioned some type of ceramic coating that would be poured into the coolant passages, adhearing to the inside of the passages and sealing from the inside. Do any of you know about this process? What is it and where can I get it done? Is there any other type of sealer or process (permanent) that can be done to fix the porousity of the coolant passages with the heads off the car?
Any ideas?
TIA
_________________________________________________
I have recently aquired a set of M&A heads. Upon pressure testing it was clear that they have a porousity problem. there is a total of 6 leaks between the two heads. All but one of the leaks are external with the one leaking under the valve cover. All of the leaks have been attemted to be repaired by a previous owner via either welding or apoxy unsuccesfully. I have heard about GM tablet sealer, Irontite and K&W sealer which all would be done after install. A freind mentioned some type of ceramic coating that would be poured into the coolant passages, adhearing to the inside of the passages and sealing from the inside. Do any of you know about this process? What is it and where can I get it done? Is there any other type of sealer or process (permanent) that can be done to fix the porousity of the coolant passages with the heads off the car?
Any ideas?
TIA