It can if the nuts aren't tight, It kind of sounds like you have a head gasket problem to me from your description, the head bolts are supposed to be replaced when a new gasket is put in. Is the head bolts what you are talking about not tightening and not the exhaust manifold bolts? You may have stripped the holes as the head is aluminum and bolts are steel.
Thursday, July 28th, 2016 AT 5:40 AM