Hi Griff
I use epoxy metal for all sorts of high temp/strength bonding but for something not needing to have much strength, high temp silicone would be something to try it you want it removable, the proper Loctite automotive gasket stuff (5910) though not the B&Q sealants.
Failing that standard Araldite would be a good choice, anything epoxy will stand engine block temps.
Rob
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