Howdy fellas, My '72 TR6C has had leaky rocker boxes despite every effort. So far I've trued the mating surfaces, tried different types and brands of gaskets, different sealants, changed/removed washers between the
rockerbox and head bolt, etc. etc. etc. and no matter what they still leak at the gasket joint! I won't use RTV, but I've tried Indian Head shellac, Hylomar, none, yamabond and no ...