I have been attempting to find NOS AC-45 and AC-46 plugs. Oh I have found some but the sellers are wanting $18.00 to $27.00 each plus shipping. Not gonna happen! An old friend and mechanic friend of mine that did some work for NASA told me that years ago NASA requested that all spark plugs had to have resistors in them, Thus the R in front of the plug number. The non resistor plugs were affecting the radio signals from space. I remember my brothers full house 57 Chevy. We could tell when he was coming down the road to the house by the TV crackling and messing up the picture. The same was true on our AM radios in our cars, we had to tune the channel exactly on the station or we got ignition buzz and pops. I wonder if that would be a problem today with the many radio wave links and FM. Ed
