Which spark plug to use?

[Jimmyspeed59]

i have a 1970 challenger with a 440 six pack with compression just under 10 and iron 452 heads basically a stock build. Also I’m using a FBO ignition system. I know the shop manual says champion J11Y but I was wanting to use a good plug that can be found at any parts store. Let me know what you guys are using. Thanks for your recommendations.

 

[dadeo1852]

Autolite 85's in my six pack 440.

 

[moparleo]

Get 2 sets of the Champions so you have a set when its time for maintenance. Champions have been the factory plugs for our MOPARs forever. Unless you do major mods to the pistons/heads stay factory. Or not.

 

[Jimmyspeed59]

Which champions? Can’t find J11Y

 

[rarefish]

J12YC Champions will work...

 

[Jimmyspeed59]

Just ordered some on line today thanks