Just ordered a set in a 6. See how those do. I put ngk race 7's in and had an intermittant misfire.

Unless you have a bad plug, connection or ? no reason the 7's should cause a misfire as I've run em w/zero issues at 12.1.1 comp..........

Dont know but definitely had more misfires on the race 7's than the projected tip 5's. Could be that running on the edge of rich may not clean off the 7 like it does the 5's. Gonna leave the 7's awhile and see how they work out.

We run R5671-8 NGK with 13.7:1 on alky perfect!
It is a recessed tip we use an old Vertex magneto run the gap about .018
It lights a 10% nitro alky mix perfectly would run more nitro but have way to much compression--next one is an 11:1 so we can lay the juice to it!
I will call NGK and buy exactly what they say

No experience ever running hotter than maybe a 6 in ngk and that's too hot for most of what I mess with but you are close to 11.1 iirc so not exactly low comp. and if in fact it liked the 5's I'd look real close at the porcelain w/a mag. glass and see how they look but still say #7 if the tunes close............... Just re read that you ran non projected tips in a 7..........Is that correct cos that's not the best plug for you imo, get the 7 projected tip and let tune this thing............

Yes, the non projected tip race plug in a 7. I misunderstood you. Thought thats what i needed. The 5's looked too hot to me as the ground straps are burned white almost to the weld on the shell. I have some 6's with the double strap on the way. Ill try those next.

No biggie but I thought I gave you the stocking # 5030 and plug number BCP7ES but either way, get these and see if they help.............

yes you did, but you also gave me a stock # 7173, which is what i used to run in my small block. no big deal thou. ill try the new 6's when they get here. until then, i will use the 7 race plug. thanks

I would dump the race plug and the 7173's are the projected tip 8's..........You will chase your damn tail if you you don't do it right the first time............

Does the non resistor part cause problems?

I use Ice ignition. They recommend a non resistor plug. resistors work find in it as well.