spark plug gap?
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Junior Member
Joined: Mar 2007
Posts: 14
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From: Bremerton, Wa.
Car: 87 Iroc, recently ran 13.733 @98.54
Engine: 350 HSR
Transmission: 700R4
Axle/Gears: 3.42
spark plug gap?
I have an 87 iroc with a 350. I would like to know if I should change my spark plug gap when running a msd blaster coil and msd 8.5mm wires. I plan on running ngk v-power unless someone can talk me out of it. Thanks
Senior Member
iTrader: (1)
Joined: Sep 2003
Posts: 988
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From: St. Louis, Missouri
Car: 1989 Firebird Formula
Engine: 383 Stealth Ram
Transmission: 700R4
Axle/Gears: 3.73 9 bolt Posi
Re: spark plug gap?
I have run a msd blaster coil & 8.5 mm wires and left my gap at .035.
Joined: Jan 2006
Posts: 930
Likes: 6
From: Sweden
Car: 1989 IROC-Z
Engine: 350 TPI
Transmission: Th700R4
Axle/Gears: 3.27
Re: spark plug gap?
Go with AC Delco on your Camaro, Our camaros love their Ac Delco plugs,
Im using RJ45TS and .035 gap..
Maybe Ill try .045 intead, when i got msd dizzy and msd coil and wires.. maybe it will burn even better. !? who know..
Im using RJ45TS and .035 gap..
Maybe Ill try .045 intead, when i got msd dizzy and msd coil and wires.. maybe it will burn even better. !? who know..
Senior Member
Joined: Nov 2006
Posts: 504
Likes: 1
Car: 1985 Camaro and 1996 Mustang GT
Engine: 350 4bbl/281
Transmission: 700R4/4R70W
Axle/Gears: 9" rear/8.8" 4.10
Re: spark plug gap?
i havent had any issues with delco, but perfer NGK. i would gap at .040 to .045. thats (.045) what i ran for a long time with no issues (before my HEI stuff).
Joined: Mar 2000
Posts: 43,187
Likes: 43
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
I know MSD recommends trying a larger gap with their box & coil, but I don't recall if they do for just their coil. Even so, their recommendation is a try & test process.
I ran the plugs in the 396 .010" over stock (NGK's), dropped it down to .005" over for the nitrous 100-shot (switched to AC's). Seemed to work well.
I ran the plugs in the 396 .010" over stock (NGK's), dropped it down to .005" over for the nitrous 100-shot (switched to AC's). Seemed to work well.
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