Spark plugs

[TheCouzin]

Good day, team,

Following up on previous communications, I've recently acquired a 1967 Coronet equipped with a modified 440 engine, reportedly generating approximately 542 horsepower.

The vehicle features aluminum Edelbrock cylinder heads and an MSD ignition system. During a routine spark plug inspection, I observed Autolite 3924 plugs installed. I'm seeking direct cross-references for NGK and Champion spark plugs to ensure optimal performance. Online resources have provided conflicting information, and I would appreciate expert guidance on this matter.

Your assistance is, as always, highly valued.

Thank you.

 

[Jerry Hall]

Why not stick with the Autolite? Autolites seem to run and last in my Mopars. Champion never seem to last for me, and NGK has been a choice of many here, but I haven't personally tried them.

 

[TheCouzin]

Why not stick with the Autolite? Autolites seem to run and last in my Mopars. Champion never seem to last for me, and NGK has been a choice of many here, but I haven't personally tried them.

More so just a personal preference.

 

[RemCharger]

I would go with an R5671A-6 .. or -7