North American Turbocoupe Organization

Side Gapped plugs...
Jeff K Offline
I tried Splitfire plugs when they first came out in my 5.0 with 100 HP nitrous kit. I did not notice ANY difference in anything (WOT acceleration, MPG, idle stability, etc) between the Splitfires and the stock Motorcraft copper plugs. At the next plug change I went back to the OEM Motorcraft plugs that were 1/3 the price of the Spitfires.
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

BigJake Offline
Back in the day I put a 302 in my 65 Falcon with TRW 12-1 pistons and Vic Jr heads. After gapping the plugs the pistons would close the gap due to contact so I cut the electrodes down and side gapped them and was good to go even with a 275 shot.
1987 Thunderbird Turbo Coupe 5 speed Boosting 25 PSI with Boport/Stinger parts !

Kuch Offline
Senior Member
They actuaally do make plugs already side gapped like this. Autolite sells them as their AR numbered plugs. I'm sure other manufacturers do, but the Autolites I know of, but they are more expensive, just do the yourself and save.
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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