• If you like antique engines, vintage tractors or old iron machinery, register and join us. When you register on Smokstak, please give complete answers and fill in all blanks. IF YOU ARE ON WIRELESS OR SATELLITE, GIVE YOUR CITY AND STATE! NO ZIPCODES! All registrations are manually approved.

What's the difference

Last Subscription Date
I am working on a Continental AVI 1790 v-12 engine. Stock plugs are a Autolite AER3S None available. Autolite AGR3S is available. What is the difference? Autolite tech dept. tells me once a plug is discontinued all info is purged from their system. Cross ref. is taking me nowhere. PLEASE HELP ASAP


Last Subscription Date
I just looked in my old Champion book AER3S transfers to (x)RML12 Champion. I don't know if that is any help.


Last Subscription Date
If I'm looking at this right, the "R" is 1/2" reach and the "G" is 3/4" reach and a 2384 would be the modern day equivalent Autolite shielded plug.