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Old 11-09-2017, 12:56 PM   #4
Jim Brierley
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Join Date: Jun 2010
Location: Temecula, CA
Posts: 3,440
Default Re: spark plugs for a Weiand head

I am not familiar with the L87YC, but 14mm plugs come in a wide variety of thread lengths and heat ranges. Be sure the threads do not go into the combustion chamber, they will carbon-up and can destroy the threads upon removal. Many early aluminum heads used H series Champions, 5/8" reach.
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