New engine, which plugs should I use?
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Joined: Aug 2007
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From: Birmingham, AL
Car: 1991 Camaro RS
Engine: 355
Transmission: 700R4
Axle/Gears: 10 bolt Richmond 3.73 posi w/ discs
New engine, which plugs should I use?
I'm wondering what would be a good start for plugs in a 355 10.5:1 engine with alum heads. I have a 50k Volt coil & 8mm wires. I was thinking around a delco 44T with .045" gap but I'm no expert in this field.
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From: Chasing Electrons
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Re: New engine, which plugs should I use?
I would check with Brodix for their recommendation. Note that many aluminum heads use a 5/8" hex, flat gasket, 3/4" reach plug. An example would be the Autolite 3924. Start with a .035 gap.
RBob.
RBob.
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From: Bright, IN
Car: '86 Bird, 96 ImpalaSS, 98 C1500XCab
Engine: LG4, LT1, L31
Transmission: 700R4, 4L60E, 4L60E
Axle/Gears: 3.73 Tors, 4.88 spool, 3.73 Eaton
Re: New engine, which plugs should I use?
OOPS! Missed the Brodix heads.
Not sure what style/reach plugs they use. My suggestion of NGK TR55's was based only on the proper heat range.
Not sure what style/reach plugs they use. My suggestion of NGK TR55's was based only on the proper heat range.
Last edited by 86LG4Bird; Sep 25, 2007 at 11:53 AM. Reason: Corrected reply
Thread Starter
Member
Joined: Aug 2007
Posts: 282
Likes: 1
From: Birmingham, AL
Car: 1991 Camaro RS
Engine: 355
Transmission: 700R4
Axle/Gears: 10 bolt Richmond 3.73 posi w/ discs
Re: New engine, which plugs should I use?
I believe the 3924 is one of their reccommendations however I wasn't sure about what heat range and what size gap would be a good base line on a modified engine with larger coil.
Re: New engine, which plugs should I use?
You usually don't have to start worrying about different heat ranges and gaps until you start using nitrous, forced induction, or turbocharging. Compression ratio can be a factor, but not really until you exceed about 11.5:1. I agree with Rbob, start with the standard gap/heat range, and go from there.
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