Due to teh warning I read about restricting the coolant at the heater core, I used a thick stainless washer with a ~1/4-5/16 hole in it, installed in the heater hose right at the heater core inlet, pushed it down in the hose as far as the hose goes on the core inlet. I also use a AN fitting in the head that has a smaller opening in it than the ID of the heater hose, both those things restrict the flow if that helps the heater core any... I didnt thing it would be a problem but was talked into adding the washer just to be safe.
The head bolts dont need any sealer, but the top 2 valve cover bolts do need some, i use normal thread sealer that lasts a couple time removing, using studs with loctite works too.
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