What plug gap size with this ignition system?
Thread Starter
Supreme Member
Joined: Oct 2002
Posts: 1,042
Likes: 0
From: Oklahoma City, OK
Car: 92 Z28
Engine: 357 TPI (L98)
Transmission: 700R4
What plug gap size with this ignition system?
I know stock is like .035 and many recommend raising it to .045, but I just bought the "Screamin' Demon" coil from DUI (Performance Distributors), along with their module, MSD cap, rotor, and superconductor wires. On Performance Ignition's site they said something about being able to gap up to like .070 with their coils. What do you guys think I should gap them at that will give me the best performance and etc? Thanks.
Supreme Member
Joined: Nov 2001
Posts: 1,526
Likes: 0
From: Cleveland, OH
Car: '87 Camaro LT
Engine: 355 L98
Transmission: T56
I wouldn't go any more than .045. The only thing a bigger gap does is maybe improve idle stability but a bigger gap also means a higher required voltage to fire the plug which turns into more wear on all the ignition parts.
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Joined: Jul 2001
Posts: 5,225
Likes: 70
From: Buffalo, NY
Car: 1988 IROC-Z
Engine: 427 SBC
Transmission: ProBuilt 700R4
Axle/Gears: Moser 12 Bolt / 3.73 TrueTrac
I have a MSD Blaster coil, Msd dist cap, rotor, and 8.5mm super conductor wires. I gapped my rapid fires at .045 with good results.
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