724xz

Alright got a 85 720 2.4z blew head gasket between 3 & 4 replaced it along with the pesky tensioner deal got everything back together and adjusted valves cranked and there is a constant tapping noise coming from the same area. also before start I went through the bottom end main bearing caps before accepting the headgasket failure, any ideas, valve sticking, piston failure from cam timing? Sounds about the same as when it blew less the miss.