Possible rod knock?

if it was a rod i'd expect it to be there all the time once the motor is warmed.


if its pre ignition get out your magnifying glass and go across all plugs
the one with little bits of metal speckles on it is the problem cylinder
you do really need an eye glass or jewelers loupe to see properly

or course you might just have piston slap
how old/ worn is the motor?
this should decrease somewhat when hot because the piston expands slightly. but worn bore and skirt it can be there all the time.

fist things first though check the exhaust manifold gasket this makes a tick when there is a section blown out

Dave