Hi Jeff,
My first question is are you using a sleeved thermostat?
If not then this could be a contributory factor to your problem.
It is my understanding that if a sleeved thermostat is not used there is a
lack of water circulation to the rear of the cylinder head causing localised
overheating or a possible airlock. Either would blow a newly placed core
plug.
This only a suggestion of a possible cause, it may be just that the wrong
size was fitted. Core plugs come in metric and imperial sizes. As for a
sealer I always use 'Loctite'
Regards
Adrian
TR4A CT64306 O
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