1970 340 SPARK PLUG RECOMMENDATIONS
Just for the fun of it I "Sonic Cleaned" some old Champion RN12YC from back in the day, they cleaned up like new.
Have been running them in my stock 360 4 bbl. They are working great and burning nice and clean.
Pictured below are the plugs, this was after a pretty good run with non ethanol fuel in the tank.
Fun to put them back into service . . .
Just for the fun of it I "Sonic Cleaned" some old Champion RN12YC from back in the day, they cleaned up like new.
Have been running them in my stock 360 4 bbl. They are working great and burning nice and clean.
Pictured below are the plugs, this was after a pretty good run with non ethanol fuel in the tank.
Fun to put them back into service . . .
