HEI: Ignition box or ignition module

[mclairmo]

Coil Bind is when the coils stack solidly during valve lift. The following is from the Comp Cams website. "Once the valve springs have been installed, it is important to check for coil bind. This means that when the valve is fully open there must be a minimum of .060" clearance between the coils of both the inner and outer springs. If this clearance does not exist, you must change either the retainer or the valve to gain more installed height, or change to a spring that will accommodate more lift or machine the spring seat for extra depth."