Autolite Spark Plug
 

Anybody have an old application chart for Autolite? I have a box of AL-9 plugs which I think are for flathead. Tried their web site but it didn't have any info on them.

Re: Autolite Spark Plug
 

I use 216 in my 8BA.

Re: Autolite Spark Plug
 

According to the charts I have, AL-9 plugs are Motorcraft std. (AL82 is the powertip) and cross with Autolite 217/497 and Champion H11. These are all flathead plugs, (7/16" reach, 13/16" hex) but one step hotter than normal.

Re: Autolite Spark Plug
 

I used Autolite plugs in my 55 Buick, in those days called power tip, lasted longer and better gas millage. I have also used extended tip plugs in my flat heads, but you have to do some measureing to make sure the valves do not hit the electrodes.

Re: Autolite Spark Plug
 

Thanks for the info.

Re: Autolite Spark Plug
 

al7 was the std plug for flatheads al9 was 1 step hotter. al7s worked well,that was 50 60 years ago. scotty