Spark plug question ???
While doing my valve cover gaskets, I notice how much easier the plugs looked like they would be to change without the valve covers installed.
I pulled a plug out, it is a Champion RF91C, it seems to be burning good...I have no idea how old they are, or if they are even the right plug.
I have a 428, with CJ heads, MSD box.
What would be the correct plugs for this engine...also, what should the gap be.
I did search but only found small block info!
Dave
93 Unique Motorcars 427 SC, 428PI with CJ heads, toploader 4 spd,jag rear with 354 gears, Red with white stripes.