have the car up on the rack gas shutoff so it wond start.when compression reaches the middle clclinder we hear a loud chirp (gotta be air escaping) this only happens on rotation when the clclinder reaches the top position and forces air out.thought it was a head gasket except no collant leaks no escape marks did a smoke test nothing, if the plug was loose could the compression cause this noise?? car runs strong, no smoke any color,just this dam chirp

 

it was a loose plug all is well thanks to ben at salerno motor sports in rocklin. could see the blk tracings around the edge of the plug.....no more chirps

he stayed late on fri nite so i could go on my sat am drive