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bowtie4542001 10-23-2008 03:02 PM

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

zipper06 10-23-2008 09:16 PM

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.

bowtie4542001 10-23-2008 10:19 PM


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

zipper06 10-23-2008 11:13 PM

I run .030 gap with alcohol.

Zip.

bowtie4542001 10-24-2008 12:28 AM


Originally Posted by zipper06
I run .030 gap with alcohol.

Zip.

Appreicate the help, which NGK plug?

Chris

zipper06 10-24-2008 07:11 AM

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.

bowtie4542001 10-24-2008 10:53 AM

Thanks Zip

bigray 10-26-2008 08:28 PM

when you index them.witch way sould they be facing ?????

nofear57 10-26-2008 08:56 PM

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.

hammertime 10-26-2008 09:08 PM


Originally Posted by bigray
when you index them.witch way sould they be facing ?????

between 10 and 2


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