What are your thoughts (anyone) on the original type the Spares sell. They are black on one side, red on the other. I have been running them whenever needed but always interested in THE BEST solutions.
Certainly not all gaskets are created equal. I try and buy only gen-spec gaskets and its seemed to be a good plan so far. I only recently got a leak from the timing side...for the first time AND after multiple rebuilds. One of the few Minis that didnt leave its mark everywhere. Used the Rover timing cover gaskets with the dry "sealant" stuff built right onto the gasket. Did me right until recently but that would be an out of shape cover I suspect.
Those are the gaskets that leaked for me. Only 0.4mm thick, maybe ok if the top surface of the head has been skimmed and you're using a billet alloy thermostat housing but I couldn't get them to seal.
Never had an issue previously or since with the 1.6mm thick blue gaskets from minispares or other sellers. Cork ones are ok too but keep squidging out the side of the housing.