need help Bad-excuse me for being stupid

trudysduster said
well I put the Autolite 85 plugs in here the other day. changed the carb out with the Thunder series 650 carb and I liked the way it ran. lot better low end torque. thought I was set. Left this morning to go to the car show that was about 25 miles away and just before I got to the show, I noticed the car had what felt like a vibration. A kind of a shake. I noticed when I got in it a little, the ping returned a little. It feels like there is a problem with the plugs not firing right. maybe I have a bad one. any ideas. some say the Autolites are junk. some say their Mopars does not like Autolites. change them. maybe I have a female Mopar engine and she is very particular. Go back to the long reach champions that I had it it, RV12C. Maybe go to a short reach Champion RJ14yc. any suggestions is welcomed.

What I was tryin' to get to earlier. I don't / haven't had any of the late heads, but from what I've read it appears those heads might have been made either way---for gasketed short reach plugs, or the tapered seat peanut plugs. Generally, they don't interchange

Also, you can not compare heat range between the two types of plugs. Heat range is an arbitrary number. "What might be true" for a 3/4 reach SB plug, example, is not true for a short reach BB/ RB plug.

If you have some way of posting a GOOD clear photo of one of the plug holes, both "empty" and with a peanut plug in place, some of these guys might see what you have.

It still seems to me very likely that if the peanut plugs were in there and ran good for (did you say 10 years?) that they might be the correct reach plugs.