i really want to get back to using delcos ...and i figured i would try the rapidfires. HOWEVER, all i can find is ones factory gapped at .045! I have a 91 305 RS which as most calls for .035 gap. is there something i don't know? do you guys go with the larger gap or do you "bang it" down a bit? i have heard of larger gapping, but i always thought it was taboo for a basically stock car. thanks in advance!

 

Hey man, I bought the AC Delco Rapid Fire plugs, I am very happy with them. When I bought them, I checked the gaps, and thought they were too big, so I gapped them back to .035 like it says to gap plugs on the sticker under my hood. Well I took the car to my mechanic friend's shop for him to do the tune-up for me, and when he was done I asked him how everything went, and I told him that I gapped the plugs for him. He told me they were wrong, and that he re- gapped them. And that they are supposed to be.045 with those plugs. I didn't believe him, so he had this big manual that he pulled out and showed me. He explained the reason to me, but I really don't remember what it was. Maybe because they burn hotter. Not sure though. But you did purchase the right plugs. Hopefully this helps you a little.
Later
Mike

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Gran Turismo Americano "The Ultimate Firebird"
Smokin 1989 GTA- Bone stock except for exhaust. (no catalytic-stainless pipe into Flowmaster 2 chamber) & AC Delco Rapid Fire Plugs

 

really...veeeerrrry interesting...i didnt actually get the plugs yet for that reason, but i probably will now...thanks for the feedback. anybody else runnin' with rapidfires?

 

Many people say that the stock .035 gap is very conservative for our ignitions. .045 should be fine. I'm running .05 but i've got MSD and Crane Fireball coil and wires.

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85 2.8L Sport Coupe 5-speed.
Mods: Hpertech chip and powerstat, MSD 6A-L, Crane fireball coil, Accel Cap and Rotor, Dynomax hi-flow cat and catback system with a dynomax magnum race bullet muffler on the i-pipe, K&N filterchargers, Gutted Air Boxes, 8mm Wires, Eibach Sportlines and Tokiko springs/shocks setup, Global west sub frames, Suspension techniqs front and rear sway bars, and good ole 88 IROC wheels with Kumo Ecstas on em!
"It's not the ricers, it's those damn V8's!"

Wins: 2000 V6 Accord, 69 302 Mustang, 2000 Auto VR6 Jetta, 89 Toyota MR2, 90 Civic Si, 76 350 Camaro, 2000 3.8 5-speed Camaro, ~68 Chevelle 350, 92 CRX Si.

 

I ran mine at a .050 gap with a MSD 6A, Hypertech coil and MSD low resistance wires and had great results from when I took out the Bosch platinums with a .045 gap and put the .050 gaped Rapidfires in the old T/A. No the old plugs were not fowled, they only had 3000 miles on them.

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89 Trans Am Turbo 3.8L All stock 43,000 miles #1053 of 1555

Past Thirdgen:
86 Trans Am w/ built 355TPI with SLP goodies and too much other stuff to List. One sweet *** car, wish I would have had a good enough Job to pay insurance on three cars so I could keep it, but for a 89 Turbo Trans Am w/ Low miles, I think I made the right choice!

 

Bigger gap won't hurt anything as long as your plug wires are in good shape.
-Rich-

 

i use rapidfires @.45 gap. no problems

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See if you can get the platinum tipped RapidFires.

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92Z28
89GTA

 

whoam I gapped myRocsplus at .035, should I take them out and re gap them to .045? Could I possable gain more power or should i just leave em?

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1987 Black 305 TPI 5spd IROC, seems to be fully loaded, but can't find RPO codes.

AIM: IROC 5spd
http://www.geocities.com/chevy5spdiroc/87Roc.htm

 

I also have the Rapidfires, @.045". I slapped a set of 'vette heads on my Camaro and when I went to Advance I just went ahead and got what they had listed for the 'vettes in '88. Don't know if it matters, but, I'm running Accel wires, cap, rotor, and coil.

-Mark W.
'88 SC Camaro w/ 305 TBI

 

How does the gap of the plugs affect the car's performance. I have a 300+ wires and then AC cap, rotor and rapid fires gapped at .035, what would changing that gap to .045+ do?

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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission
Borg Warner 7.75" 9 Bolt Rear End with 2.77:1 Gears.

Current Mods: LT4 HOT Cam, Comp Cams 1.52:1 Roller Rocker Arms, Accel High Flow TPI Baseplate, Edelbrock TES 1 5/8" Headers, Catco 3" High-Flow Catalytic Converter, Hooker 3" Aerochamber Cat-Back System, Transgo Shift Kit, Performance Resource Chip, Accel Ignition, K&N Filters, Jet TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET: 14.32 @ 97.7mph
(corrected for elevation)