kobrak

Folks, finally getting back to doing a bit of work on the Z car. I was going to knock the bung hole out of the header to put in the stock O2 sensor and it ends up it is not going to fit. The header hole is fine thread and a bit bigger??? how the heck does one find the correct sensor? heck, I don't even remember the flavor the headers are? I just assumed that if it stated they were a fit for the year car I have I would be good to go. no good!