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07-13-2014, 03:57 PM | #1 |
Getting Wild
Join Date: Jun 2009
Posts: 84
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Spark plug for HEI conversion
Converted my 88 marathon over to an HEI, been going thru 2or3 spark plugs a year. Installed a new one, and with in an hour I had a hard time starting and maintain running once I did get it going.
Not sure if I need a hotter or colder plug. Im using an NGK BP5HS, which. I used in it before I made the conversion. Can someone that has done the conversion guide me on a plug that will work better. Thank you in advance! |
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07-13-2014, 04:02 PM | #2 |
Gone Wild
Join Date: Oct 2010
Posts: 6,730
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Re: Spark plug for HEI conversion
You shouldn't need to change the plug heat range. What is the gap set to?
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07-13-2014, 04:49 PM | #3 |
Getting Wild
Join Date: Jun 2009
Posts: 84
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Re: Spark plug for HEI conversion
Check the one in my cart and a new one in the box, both are at. 026
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07-13-2014, 05:11 PM | #4 |
Gone Wild
Join Date: Oct 2010
Posts: 6,730
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Re: Spark plug for HEI conversion
Open the gap to .040". HEI requires a larger gap. If that doesn't help the starting/running issue, I'd look for something else that is causing it.
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07-13-2014, 05:20 PM | #5 |
Getting Wild
Join Date: Jun 2009
Posts: 84
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Re: Spark plug for HEI conversion
Thank you. I will give it a try. I appreciate it
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07-13-2014, 09:06 PM | #6 |
Getting Wild
Join Date: Jun 2009
Posts: 84
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Re: Spark plug for HEI conversion
Thanks for the advice. Opening up the gap made a world of difference. Fixed most of my issues.
Last edited by nsmithjr; 07-13-2014 at 09:07 PM.. Reason: misspelled word |
07-13-2014, 09:11 PM | #7 |
ΜΟΛΩΝ ΛΑΒΕ
Join Date: Nov 2012
Location: West Virginia
Posts: 4,094
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Re: Spark plug for HEI conversion
The Engine Whisperer strikes again!
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07-13-2014, 09:16 PM | #8 |
Gone Wild
Join Date: Oct 2010
Posts: 6,730
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Re: Spark plug for HEI conversion
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