what about Dow730?
It is expensive, about $70 per tube, but I have never had a leak since using it. When I refresh my engine (about every other year) I go to my friends shop and borrow the tube. seal my engine and return the tube...
The first time I rebuilt a 911 i used permatex pliobond....go figure it works and is cheap..
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'69 911 GT-5
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