Which spark plug?

[jim0207]

Should stock AC 44's be used in my GN? I switched over to alky and loving it. She runs 11.6 with this marvelous system. Thanks in advance.

 

[turbojd]

Up to 20 lbs of boost you could use AC Delco R43TS or CR43TS, Autolite 24's, NGK UR 5's
If you run over 20 lbs. of boost you could run, AC Delco R42TS, Autolite 23's, etc.

 

[Roc87]

I ran 29# with the NGK UR5's for years gapped at .031-.032.
11.6@109? Must've been a great 60'

 

[huntsg]

Auto lite 23s gapped at .028. I was thinking that 60' must have been good too. What tires?

 

[TT/Ameasap]

He had to of let off. Car should be in the 115 range
I used to run R42TS with another car in the 11.3's-11.4's gapped at .030

 

[Phoneguy]

Does everyone run tapered seat plugs in their GN1's ? The heads will take both tapered seat and gasketed.

I use NGK 5671A-9 Non projected tip, gasketed gapped at .022

Bryan

 

[jdsgnx]

Auto lite 23s gapped at .028. I was thinking that 60' must have been good too. What tires?

agreed 100%!!!!!!!!

 

[we4Mateo]

You guys can open those gaps up if you stop using the stock ignition system. Probably not a big deal on a track car, but the bigger gap makes cruising around a lot better. I've had zero spark issues with NGK UR5s gapped at .040. TR6 ignition module and $60 Silverado coil pack.

 

[Mr.Spool]

Also if you want a more recessed plug the ac deco r43t is a nice plug

 

[hotairgnx548]

anyone useing the recessed ngk yr5 @ .030. Thats what I'm going to try next on my hot air car. Anybody agree? See ya! John Happy New Year to all.