With aftermarket heads(TFS) and the recent nitrous system that I'm installing, the instructions for the zex kit suggest using a plug 2 heat ranges cooler. I've been using Motorcraft AGSP 32C, but before using nitrous I know this should be changed for cooler plugs.
Any suggestions on what plug I should be using now for TFS heads and nitrous?
Can the Zex plugs work for this application?
I've had a look and know that lots of people are using autolite 23's for nitrous, but on stock heads. The thread length required for the heads I'm using are much longer than the autolite 23's. Thanks
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1993 LX Coupe
TFS heads ported,Cobra intake ported,Zex dry 125hp ,Crane 1.6 rollers, FMS 65mm TB, FMS 30 lb injectors, Kirban regulator, C&L 80mm MAM , Speed Pro 496-510 Cam, Black Magic electric fan, Mac exhaust, Mac underdrive pulleys, FMS 3:55 gears, K B Sub frame connectors, Mega Bite jr. control arms, Weld drag lite 3.5" front and 8" rear.
I used NGK's two degree cooler plugs and gapped them at .35 with a 125 shot..no problems. I have Edelbrock heads, and the plugs still look great after 3-4 bottles and a year.
Thanks Julian, is it possible to get a plug number off you so I can compare the thread length to see if it will work on trick flows. I'm wondering if I just go to the parts counter at Ford and ask for 2 heat ranges colder for the AGSP 32c, you think they could do this? hmmm
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1993 LX Coupe
TFS heads ported,Cobra intake ported,Zex dry 125hp ,Crane 1.6 rollers, FMS 65mm TB, FMS 30 lb injectors, Kirban regulator, C&L 80mm MAM , Speed Pro 496-510 Cam, Black Magic electric fan, Mac exhaust, Mac underdrive pulleys, FMS 3:55 gears, K B Sub frame connectors, Mega Bite jr. control arms, Weld drag lite 3.5" front and 8" rear.
1993 LX Coupe
TFS heads ported,Cobra intake ported,Zex dry 125hp ,Crane 1.6 rollers, FMS 65mm TB, FMS 30 lb injectors, Kirban regulator, C&L 80mm MAM , Speed Pro 496-510 Cam, Black Magic electric fan, Mac exhaust, Mac underdrive pulleys, FMS 3:55 gears, K B Sub frame connectors, Mega Bite jr. control arms, Weld drag lite 3.5" front and 8" rear.
I went to the local auto supply store here and they said there's no 3922's available right now in Toronto or Montreal so I ordered them. This was 2 weeks ago but they've finally arrived and they're the right thread length and depth for the TFS. Thanks again!
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1993 LX Coupe
TFS heads ported,Cobra intake ported,Zex dry 125hp ,Crane 1.6 rollers, FMS 65mm TB, FMS 30 lb injectors, Kirban regulator, C&L 80mm MAM , Speed Pro 496-510 Cam, Black Magic electric fan, Mac exhaust, Mac underdrive pulleys, FMS 3:55 gears, K B Sub frame connectors, Mega Bite jr. control arms, Weld drag lite 3.5" front and 8" rear.
That's exactly what I was looking for, this is tech article stuff. Great find Ford4life, Thanks!!!
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1993 LX Coupe
TFS heads ported,Cobra intake ported,Zex dry 125hp ,Crane 1.6 rollers, FMS 65mm TB, FMS 30 lb injectors, Kirban regulator, C&L 80mm MAM , Speed Pro 496-510 Cam, Black Magic electric fan, Mac exhaust, Mac underdrive pulleys, FMS 3:55 gears, K B Sub frame connectors, Mega Bite jr. control arms, Weld drag lite 3.5" front and 8" rear.
Spark plugs, Nitrous and aftermarket heads? 
