Maybe it's dumb, but I just bought $300 worth of autolite plugs and already have a couple sets in the garage. I know I could just move on to NGK, but Autolites have always worked for me. They're my go-to in a basic H/C/I car (3924), and in Black Jack with nitrous (3923). So, I've got 10 or 11 sets now. Hope that'll last me the rest of my life.
Where did you find them?Well I just bought 8 sets for about $2.50 a plug shipped. Have four cars running them so should be good.
According to Chat GPT after I asked if the 5671A-7, like in my turbo cars but a step hotter is the right replacement, it gave me an entirely different plug number. I have not personally validated it, but I know the 5671A-7 would be a decent replacement plug if it burns clean on the street. I use a -8 (one step colder) plug in my turbo strokers. The -8 would probably be in the 3922 temp range. Maybe that means a -6 or a "BKR6..." would be good as a 3924 replacement.Ah. My 3924s are like 10 years old. I didn't get the memo. Maybe I need to hike it down to O'Reilly's and stock up too. What is it, an NGK TR5 that replaces the 3924? It's been so long since I looked it up.
Kurt
According to Chat GPT after I asked if the 5671A-7, like in my turbo cars but a step hotter is the right replacement, it gave me an entirely different plug number. I have not personally validated it, but I know the 5671A-7 would be a decent replacement plug if it burns clean on the street. I use a -8 (one step colder) plug in my turbo strokers. The -8 would probably be in the 3922 temp range. Maybe that means a -6 or a "BKR6..." would be good as a 3924 replacement.
"NGK BKR7ES-11, gapped down to about .032–.035": best replacement for your known-good Autolite 3923.
NGK R5671A-7: reasonable if you want a more race-oriented, non-projected plug while keeping heat range 7."
It also says that the TR5 differs in 3 ways:
Its a -5 heat range, which might be on the hot side of a 3924. It has a tapered seat instead of a gasket. And, it has a .708" reach instead of .750". I've heard of this plug before, so it must be something I've seen other guys run, but don't think I ever used it.
I have found chatgpt to give dubious information at times.
Where did you find them?
So true.Just a little tip from all the small tire racing stuff.
NGKs are easier to plug read while tuning. You’ll usually hurt the plug or see something is going on before it gets real bad where as for some reason it will hurt an auto lite and it’s always a little to late.
Just a little tip from all the small tire racing stuff.
NGKs are easier to plug read while tuning. You’ll usually hurt the plug or see something is going on before it gets real bad where as for some reason it will hurt an auto lite and it’s always a little to late.
I can confirm this on multiple 1300-1600 plus hp carsI heard that a long time ago. People don't like the Autolites, because the ground strap doesn't melt away when it gets too hot. The NGKs act like a fuse.
Kurt
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