Just changed to a smaller pulley on my Vortec. Doing a cam install now as well. Currently running Ngk tr6. Should I stick with them or go br7 or Autolite. Willing to try out a new plug and see how it goes. 383 hitting 14psi

Thanks

 

I'm running Autolite 104's. Stock is 106 so that is two heat ranges colder. Ed Wright, who did the initial tune on my car some years ago, stated that he liked Autolite. Lot of people running the NGK plugs on here though--maybe someone can give you some advice on which one to use.

 

I have run both Autolite and NGK. I personally feel that both plugs are good, pick what you like. I am running 2 stages colder as well for N2O, but don't have the technical knowledge as to if it is required for boost. I would guess so being the boost is technically doing the same thing as N2O mechanically vs chemically.

 

What spark plug gap are you guys running? Thanks

 

I've been running mine at .025 but last time at WOT in 4th gear it hiccupped so I guess I'll set them down to .022.

 

I have been running .035 but I may try closing it up some. Thanks

 

I was at .32 and haven't seen any issues, though I haven't sprayed it.