North American Turbocoupe Organization



Half thread or full...
Kuch Offline
Senior Member
#1
I see we have two choices of spark plugs for our cars, the full threads, and the half threads. I know each style works in a turbo head, but is one better over the other? Does one place the electrode better in the chamber for our turbos? Thoughts?
1988 Turbo Coupe, Black/Black, 5 Speed, Moonroof,  T3/T4 50 trim, ported E6, 255LPH, BBK AFPR, 3" DP dual 2.5" w Hooker Maxflows, MGW shifter, K&N, Gillis valve, RR cam
1964 Ford Galaxie 500XL, 390 6V, 4 Speed, Vast and fast
1960 Ford Starliner, 292 Y Block, 3 Speed, slow and low
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Jeff K Offline
Administrator
#2
I have run NGK 2238 / TR5 plugs with 24 psi boost for 15 years. Zero issues and seem to last longer than the OEM plugs. Stay away from Autolite plugs. They are made in caves in the third world these days.
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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Kuch Offline
Senior Member
#3
Bummer about the Autolites, I have run them in all my cars for years. I'll check out the NGK's. Thanks
1988 Turbo Coupe, Black/Black, 5 Speed, Moonroof,  T3/T4 50 trim, ported E6, 255LPH, BBK AFPR, 3" DP dual 2.5" w Hooker Maxflows, MGW shifter, K&N, Gillis valve, RR cam
1964 Ford Galaxie 500XL, 390 6V, 4 Speed, Vast and fast
1960 Ford Starliner, 292 Y Block, 3 Speed, slow and low
Reply

anasazi4st Offline
Senior Member
#4
(05-08-2020, 08:38 PM)Kuch Wrote: Bummer about the Autolites, I have run them in all my cars for years. I'll check out the NGK's. Thanks

“Made in caves”. Love that.
Another proud dues-paying member.

1987 Turbo Coupe w/T5OD, 8.8 axle, grey smoke; most options. Got it in 1991 with 41K miles: 3 turbos, 2 heater cores, 1 T5OD full rebuild, 5 clutches, 1 head gasket, 2 Teves II ABS units, etc. later....
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