Passenger Side Header, Exhaust and O2 Sensor – 2 Hours

Earlier in the week the O2 bung was TIG welded to the passenger side header, per FAST EFI instructions the O2 sensor need to be at least 20” from the cylinder head and at an angle greater than 10 degrees above horizontal. This is to stop moister collecting and rusting out the sensor.

A ¾” hole requires drilling in the header prior to welding in the O2 bung.

As with the driver’s side, the header was mounted using Stage 8 bolts and fasteners. When the exhaust was mounted and checked for parallelism to the frame and horizontal to the floor it was found that the passenger exhaust flares outwards by 1” over the length of the exhaust.

It was too much to expect that both would be perfect. This alignment is easily fixed with a tapered wedge from Breeze Automotive (see web links).