I have a stock hemi that has some slight bolt on upgrades to it, exaust, cold air intake, and about to have some MSD coils on it! My question is, should I use stock heat range plugs or one step colder? Because I was told by a guy at the auto parts store to get the colder plugs, he drives a honda! The plugs that I bought are the NGK V-power plugs one step colder than stock! Will this be ok or should I go for something else? Thanks Lucas

 

You need to not listen to a Honda driver or any import driver for that matter especially one who works at Advance Auto or Autozone. You need Basic copper plugs that are stock heat range. You will have problems with carbon build-up if you install anything colder. There are few cars that benefit from colder plugs and a stock hemi is not one of them. You'll hinder your performance. Also, make sure you verify the gap on the plugs by wire guage. Those cheap $1 slider guages are unpredictable and can vary from one plug to the next not to mention they are just stamped on an assembly line rather than actually measured and verified like the wire guages.

 

Thanks Double D" that is just what I thought!!!

 

No problem. it wouldn't be much fun to change out 16 plugs and then find out they aren't what you expected. The Hemi takes 16 plugs in case you weren't aware.

 

Just got done with the swap and spark plugs in a time of three and a half hours! Went with the stock champion plugs! Seams to be running a little better with all that being over!!