Cylinder 8 chirps when fired.

[bmxmon]

That sounds pretty odd to me. Have you pulled the spark plug to see what kind of shape its in? Where the head gaskets the same thickness as the ones that came out of it?

[regislovato]

my old head gaskets had a compressed thickness of .047 in, but my new ones are slightly flatter, at .043 in when compressed. My block and head surfaces were perfectly flat and clean before I put the gaskets on, and I torqued the head bolts down to 72 ft lbs as specified by my manual, in sequence, in three steps per bolt. My Spark Plugs are brand new, and look fine. I heard somewhere that I should re torque the head bolts after letting the engine cool down after running it until it reaches its normal operating temperature, but others that I have talked to say that's unnecessary.

[bmxmon]

Its a good idea to retorque your heads. I think after I built my motor I did it after 3-400 or so miles.
I'm still pretty confused about the chirping noise honestly. Have you checked the rockers and valve train? Perhaps you have a rocker thats too tight or too loose.

[jim2f]

How often is the chirp happening. Is it rapid? does it seem to be occuring randomly or is the frequency between the chirps consistant?