Which Spark Plug

Old 10-23-2008, 04:02 PM
  #1  
bowtie4542001
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Default Which Spark Plug

Hey guys, I am needing some advice on selecting a spark plug. I have a 421 SBC on alcohol. The compression is 14:1 I have a MSD 7AL-2 with a baster coil to provide the spark. Not too familiar with alcohol. What plugs would yall recommend. Any help or advice would be greatly appreciated.

Chris
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Old 10-23-2008, 10:16 PM
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zipper06
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Which heads? If you have Brodix heads you can go to their website and they have recomendations. I run the NGK plugs which they call for with Track 1's



Zip.
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Old 10-23-2008, 11:19 PM
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bowtie4542001
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Originally Posted by zipper06
Which heads? If you have Brodix heads you can go to their website and they have recomendations. I run the NGK plugs which they call for with Track 1's

Zip.
They are Pro Comp aluminum heads. Don't know that much about them. 190cc intake runners
2.02 intake 1.60 exhaust SS valves
Also what gap should I start at?

Chris
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Old 10-24-2008, 12:13 AM
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zipper06
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I run .030 gap with alcohol.

Zip.
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Old 10-24-2008, 01:28 AM
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bowtie4542001
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Originally Posted by zipper06
I run .030 gap with alcohol.

Zip.
Appreicate the help, which NGK plug?

Chris
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Old 10-24-2008, 08:11 AM
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zipper06
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NGK-R5671A-9 for alcohol

NGK-R5671A-8 for gas

Depending on the compression you have you should probably index the plugs just to be on the safe side.

Zip.
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Old 10-24-2008, 11:53 AM
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bowtie4542001
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Thanks Zip
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Old 10-26-2008, 09:28 PM
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bigray
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when you index them.witch way sould they be facing ?????
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Old 10-26-2008, 09:56 PM
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nofear57
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My Enderle Alcohol injected Altered has a 13.5:1 sbc 434 with Brodix 11X heads and I run NGK B9ES plugs gaped at .035 and I run an MSD7AL3 with a Pro Power coil. Very reliable with no issues.
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Old 10-26-2008, 10:08 PM
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hammertime
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Originally Posted by bigray
when you index them.witch way sould they be facing ?????
between 10 and 2
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