what plugs do you guys run with your tpi motors.. ive always used ngks for my 350s but never had a fuel injected one till now... what do you guys recommend.,

 

i run the only plug thats right for a GM motor, A/C Delco.

 

AC Delco CR43TS and nothing else.

 

Of course everybody is entitled to have their opinions and that's what you will get in a topic like this. I ran NGKs UR4 (U grove) and worked super on the stock engine. I run NGK on all my cars with great results. Now with AFR heads I am also running NGKs. AC are good too. Try both and run what you feel are better

 

Any good quality resistor plug with the correct heat range and gap location. That leaves out Autolite, Bosch, Split-Fire, and Denso.

AC R43TS (or R45TS, Hotter), AC 41-817 (platinum), Champion RV15YC4 (or RV15YC6 for hotter heat range), Champion 3018, or NGK 2869 should all work just fine.