Which Spark Plug

Old 10-26-2008, 09:09 PM
  #11  
hammertime
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Autolite 3910's
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Old 10-27-2008, 02:15 AM
  #12  
bowtie4542001
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Thanks guys. I appreciate all the help. When indexing the plug, the strap should be pointed down correct.

Chris
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Old 10-27-2008, 10:23 AM
  #13  
zipper06
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Originally Posted by bowtie4542001
Thanks guys. I appreciate all the help. When indexing the plug, the strap should be pointed down correct.

Chris
Correct.

Zip.
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Old 10-27-2008, 09:53 PM
  #14  
poncholvr
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i say stay away from champion plugs , bosch arent worth a $hit either i haven't had them last in anything bikes cars, (lawn mowers) ect..
ngk are great plugs, autolite - definitely ac delco
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Old 10-29-2008, 01:08 PM
  #15  
bigray
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sorry still just a little confussed.with the head off.the gap should be facing the valves or the piston.. ops:
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Old 10-29-2008, 03:28 PM
  #16  
zipper06
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Originally Posted by bigray
sorry still just a little confussed.with the head off.the gap should be facing the valves or the piston.. ops:
I index them due to the high dome pistons and i don't want the piston to close the gap up. As you know most high dome pistons have a radius cut in the dome to clear the plug ends, but there is some power gains that can be associated with indexing. i don't know how much but all agree there is some. Indexing also allows for better flame travel, but to answer your question i think the open end should be facing the valves, but not everyone thinks this way. Here is a pretty good article by Autozone, which by the way sells the indexing washers, so does jegs,summit,etc.

JMO

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http://www.advanceautoparts.com/engl...#Power%20Gains
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Old 10-29-2008, 03:53 PM
  #17  
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Bigray, I think it is facing the valve, but double check me on that... it has been awhile.

Am I the only person out there that has fouled Autolite, NGK, Champion, etc... THEN WENT to Bosch "Platnum" & never had a problem since??? When jetting or tuning a carb (such as new one) I will never run anything else... they simply don't foul. I had NGK, & crossed over the correct heat range for my BBC & never had a problem again... they cost more, but who cares. JMO
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Old 10-29-2008, 04:34 PM
  #18  
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I draw a black line (permanent marker) on the porcelin where the backstrap is on the plug so i can see where my mark is..i try to get the backstrap in the 12 o'clock position..but 10 and 2 will work...i index for clearance insurance only..keeping backstrap as far away from piston as possible.

Brian
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Old 10-29-2008, 05:01 PM
  #19  
bowtie4542001
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Thanks Guys,
Brian I think you told me that when I was up there last time. Man I can forget things. I guess we are all getting old.

Chris
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Old 06-04-2021, 02:04 AM
  #20  
eerode
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Originally Posted by bowtie4542001 View Post
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.
Nox Vidmate VLC
Chris
I run NGK B9ES plugs gaped at .035 and I run an MSD7AL3 with a Pro Power coil. Very reliable with no issues.

Last edited by eerode; 06-04-2021 at 02:08 AM.
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