but it's only under load, if I'm just cruising I don't hear anything or its very discreet.and I'm almost positive that it wasn't there before I replaced my exhaust manifold and loose lifter but all that's been replaced. Maybe a bad gasket? How do I know for sure?what noise, the ticking? All I can hear is ticking and background wind noise. If yes; (ticking), that's your rocker arms. Nothing unusual. Maybe just have it running properly now after all that work and discovering a noise(s) that has always been there.