So tonight i went out and bought some ap104 spark plugs and my motor is basically stock except for a 4'FWI and i was wondering what should i gap them at?

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4" FWI,ZZP Shift Kit,180 T-Stat,U Bend Delete, SLP Cat-Back Exhaust, 3.5" pulley, 104's .

AP104? Did you buy platinums? I just replaced mine the other day. AL104 coppers. 104's arent really needed till 3.5 territory.

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2003 Pontiac Gran Prix GTP-4'' FWI, u-bend/resonator delete, 180 degree t-stat, AL 104's, ZZP Pcm, ZZP Stg 1 HV TB, ZZP Front PLOG, ZZP 3'' DP, 3'' custom catback,magnaflow mufflers, 3.4'' pulley.

stlmo_gtp, Platinums are not good on a supercharged motor. The bonding agent can give under boost applications and cause the platinum tip to fall off and bounce around the inside of your motor. Also as said, the 104's may be a tad to cold of a plug for your setup. I would jump up one range warmer.

webracin

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2001 Grand Prix GTP
ZZP HUB 3.2 3.4, ZZP 8 Rib conversion, JC 3" DP Gen 2 cat & U-bend Delete, Accel Super Stock 8mm wires, DHP 1.5, 180* Thermo, Throttle Spacer, SS Intercooler, ZZP Fuel Rails, SLP CAI w/K&N Cone, Dynomax cat back, ZZP Tranny.

2000 Grand Prix GTP Daytona K&N, Flowmasters

which are one range closer ? i was told to go with al 605's so that is what i am going for

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4" FWI,ZZP Shift Kit,180 T-Stat,U Bend Delete, SLP Cat-Back Exhaust, 3.5" pulley, 104's .

But he's going to a 3.4 pulley soon. So the al 104's should not hurt the engine and he'll not need them when he drops to the 3.4

I ran a 3.4 pulley on 605's with no issues at all. When I pulled them, to put in a new set, they showed no signs whatsoever of being too hot or too cold. I did, however, run a set of 104's and they did show signs of being too cold of a plug.

So from a personal experience standpoint, 605's should be fine for you.

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Scotty Hall
Bartlesville, OK
2001 Pontiac Grand Prix GTP
It whines a lot, but I like it.

The only limitation you will ever face in life is yourself!

well i ended up going with the 605's a gaped them @.55 i just haven't installed them yet, i'm waiting on my shift kit, some more feedback on the trans fluid, and picking up some oil.... so i can knock everything out at once

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4" FWI,ZZP Shift Kit,180 T-Stat,U Bend Delete, SLP Cat-Back Exhaust, 3.5" pulley, 104's .

AL 605's are a good choice, even with a 3.4 pulley.

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04 Indy SS build #972
XP, TOG's, Lightning injectors, 2.8 pulley, 105 CC springs, Wizaired, 3.29 gears, tripleedgeperformance ported blower, machined LIM, 180* tstat, RS12YC@.053, FP rewire, Alt rewire, stage 1 V boost, PRJ wires, Stage 2 IC