65 Mustang
Well-known member
Hello Everyone. I am in the process of installing the Holley Autolite 1100 efi system on my ‘65 mustang. Looking for the best spot to weld in the O2 sensor bung. Holley says to install shortly after the collection of all cylinders. It also mentions to have it higher than a 10 degree angle from horizontal to avoid water and moisture. I marked the area in the photo where I am thinking of installing it. The pipe at that point pretty much runs vertical. This means the sensor will go in perpendicular. I believe the 10 degree angle only applies when the exhaust pipe is horizontal. I don’t think water or moisture will be an issue if the sensor is placed in the marked position. Before I start welding, though, I thought I would check in with you guys. I’ve seen people weld it further downstream, but I am under the impression you will get a more accurate reading if it comes just after the exhaust manifold. Anyway, does anyone see any issues at all with O2 sensor being installed in this position? Thanks for feedback.