just wondering does the head gaskets or intake gaskets require any permatex of any kind to intall the gaskets like permatex the intake gaskets but head gaskets just go on as they are long as block surface and back of head surface are nice and clean . and they say u need to put a thread sealer on the threads of all the head bolts so they dont leak water and what sealer would that be . name of it ???? i know when i pulled my head bolts out they have grey cruskty looking sealer on them .