Originally Posted By Thumperdart
Originally Posted By dartman366
Originally Posted By pittsburghracer
Originally Posted By Sammy
NGK 5672A-9 from 14-15.5 Compression is what my friends use on their B1 engines



NA or nitrous. Thanks Sammy
I run the 5671a-9 in my car and it is NA and 12.3 comp ratio


That's a bit cold for that compression imo and I run 8's at 12.1.1..I agree on 9's for Pittsburghracer though...........

I agree with this, I also ran -8 plugs at 15:1 and would have went to a -9 for a small shot of spray.

Jim