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I have a second set of plugs i wanted to throw in, NGK R5672A-9 non resistor v power racing
I think these are 2 step colder

Can some one confirm these are correct & what the gap should be?

thanks

 

.032"

I would have gone with the 7173 instead ( thats the #8 range ) but this plug will work fine. Its the same as the 7173 but one range colder. 7405 is the stock # for the plug you have.

 

yes its 7405.. 7173 is in the car right now

when i originally was getting ready to install the kit, i purchased 2 sets of plugs. 1 step & 2 step colder, couldn't remember which was which

thanks