Hi all
I have two trucks 5.3 one of them turbo and the other one supercharged radix 1900

I'm using acdelco spark plugs it's working 4-6 months after that it come black so I need the best plug I can using it with my two trucks

 

NGK TR6 Plugs.

 

Ngk heat range 6 or 7 all depends combo.

 

lately i just run br7ef in the boosted combos

 

Depends on boost level, I use BR7ef at 14-15psi

 

so far my best running combo for idle and DD has been the stock ls9 plugs. I tried the 7's but they were really hard to get to idle smooth. 6's were a bit too warm. tried the LS9 plugs and now I can use less timing at idle with great throttle response.

 

I'm having good luck with the BR7EF on 12 PSI..