Opinions on Spark plug for boosted 420a

[GSTurbo1]

Can someone lead me in the direction... brand and numbers of plugs that someone has had success with on their boosted 420a. I', going to be running 12-15 pounds

 

[boosteddsm98]

Ngk bpr7es are a great plug to run that a lot of 4g63's run. My roomate w 420a turbo runs them as well as I do. But the issue he has is that all the new ones have a 13/16 socket on them which is to big to fit down in your spark plug wells. The older bpr7es's were a 5/8 socket and that's what he uses.

 

[GSTurbo1]

so what do I need to do ask for the one that a 5/8's socket works with

 

[DSM1G90]

420A motors run a different plug. Their stock plug is - BKR6E-11 that runs a .44 gap and uses the 5/8" socket (never heard of a BPR7ES to have a 5/8" socket size....)

Look at your stock plug number and increase the number by one to get a colder plug and you might have to set the gap closer so it won't get snuffed out by the boosted compression.

 

[boosteddsm98]

Yes that is true but with it car now being turbo. You will need to gap ## plug down considerably. Otherwise you will blow out spark.