I just installed Hooker SC LT headers on my '87 IROC. I can't seem to get the spark plug into cylinder no. 7. I have AFR 190 straight plug heads. I'm using the AFR recommended plugs, AC Delco FR3LS. Seems too long. Aside from putting a dimple on the header, any other ideas?

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Phil87IROC
Blue '87 IROC, 383 Crate Motor, KB pistons, AFR 190 heads, ZZ-9 cam, Edelbrock RPM intake, Hooker SC/LT headers, Edelbrock 750 cfm Carb (#1411), stock T-5, GM 3.42 rear w/Auburn posi.
Ohio Valley Dragstrip Trophy Bracket WINNER - 8.39 ET on a 1.82 sec. - 60'. Best MPH = 84.44. Still Tuning Carb!
Red '89 IROC L98, TES, 700R4, T-Tops, K&Ns w/open air boxes, 160 T-stat, Hyper Chip, gutted MAF & CAT, Jacobs Ign., 53kv coil, MSD wires.

 

I take it from what you said that the back of the plug hits the header tube. AC/Delco plugs are generally longer than ones from other companies. Even though I highly suggest using AC plugs in every GM car or truck, you may have to buy some shorter plugs. I know that the Accel plugs are smaller than the ACs. That maybe the only thing you can 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, Edelbrock TES 1 5/8" Headers, Hooker 3" Aerochamber Cat-Back System, Performance Resource Chip, Accel Ignition, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET (w/o LT4 cam): 14.32 @ 97.7mph
(corrected for elevation)

Soon to Come: 7.625" 10 Bolt with 3.42s and Accel TPI Intake Base