[RuralTowner]

If can confirm it's just a rpm sensitive hg leak I'll pull heads to refresh gaskets. Had to replace outlet housings as one the nipple was half gone & other leaked at gasket surface after vinegar soak. Mating surfaces were pitted. Found couple very good condition used that matched engine patina. What I could see into the head had some scaling still. Do have a couple set of heads rescued from dump that looked in good shape & if cleaner will use them. The neighborhood the dump is near being upscale I figure they're from someone that went with aluminum or offy heads so got rid of the old cast