Bill00Formula

iTrader: (4)

Have no idea what I should use. Also, is piston contact an issue?

Thanks,

Bill

narcszm

If it is an N/A motor (which I assume it is), it depends on your dynamic compression ratio (DCR). If it is higher, you'll want to run something with a cooler temperature rating like an NGK BP7EFS. If it's normal compression ratio, the NGK TR-6 will do fine.

This is a useful read: http://www.ngk.de/Spark_plugs.649.0.html

Share your static compression ratio and your cam specs and we can point you in the right direction.

Bill00Formula

iTrader: (4)

Compression will be 11.8. Cam is around 24X/25X and 62X.

thanks

narcszm

Your DCR is less than 9.3:1 assuming a typical lobe profile. I would start with the TR-6, and if you can't get alot of timing out of them, switch to the cooler BP7EFS. If you plan on running nitrous, then start with the BP7EFS.

1cdub

iTrader: (5)

agreed....I still couldn't get a reading on the 6's. Went to the 7's and can just now read the plugs. Streetability is unchanged and fouling has not occured. Play it safe.

transAm-98

iTrader: (1)

I've got a 408 with similar compression and cam size and runs great on TR-6's