Does anyone know what the correct AC spark plug is for a 69HO ?r44s?thanks

 

Hurst Performance specifications list as R-44S for the '69

 

R44S plugs have been discontinued, you can still find some out there but are becoming more expensive.
https://classicoldsmobile.com/forums...g-dilemma.html

 

I have a set of NOS R44S plugs and yes they are vintage and the Acniter version. I have owned 4 '69 HO's and these are the right plugs for that car. $90 shipped to you.

 

I have a set of R45S in mine and they are running a little cold. I thought about going to a hotter plug. R46S. Any thoughts?

 

Tom, let me know if you want to try the hotter R46S. I think I might have a nos set.
I have tried them, I get to much ping in the 400 E. I run the R44S in it and have
them in my 2 455's also.

 

Sorry I meant R46S Acniter. I have a NOS set same price at $90 shipped. PM if anyone wants them.

 

What is the Acniter version?

 

Acnitor is what AC began calling them after about 1968 or so. They became standard on 1969 GM cars. It's related to the "R"...resistor plugs...because the plug wires were changed, it was the beginning of hidden antennas, shielded ignition points, stereos, etc. I think production plugs had a single green ring, then there are 4 green ring plus in different variations. Later there was an ACnitor II version. Earlier plugs were called Fire Rings. One neat version had like cuts (like a cupcake paper) on the center electrode. Interestingly...AC stands for Albert Champion of Champion plug fame. That's your quick lesson for today..........

 

So these seem to work better and they are correct for our HO cars?

I picked up a set on Feebay last week after I noticed the issue and found out they couldn't be bought at the local parts store anymore.

R45S spark plugs are the only ones available over the counter at the local Advance. The screen reader, or so called parts guy at Advance is convinced these are the only ones made for my car. And you can't argue with a computer. LOL

 

Thanks for the lesson