There is a distinct tapping sound coming form the intake manifold(new Edelbroch 289 Performer). This sound will occur even if I turned the motor over a few times with the coil disconnected(no fire-up) so I dont think its from a hotspot. Have new heads on, engine has run about 10 mins total since rebuild. Will a bad water flow/pocket make this noise? Its not faint at all, sounds like the gerbils are trying to hammer their way out....
Thoughts?