Drilling and tapping cast iron can be a real PITA. Your local muffler shop can probably sell you a steel oxygen sensor bung for a couple bucks. Just drill a hole in the pipe just past the manifold and weld the bung to the pipe. If you decide to get a tap most auto parts store sell taps to repair spark plug holes, which I think are 18mm.
__________________
69 GMC 2500 Camper Special
88 S10 Pickup
04 Impala
I ship UPS from 24153
|