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Jim Brierley · 11-09-2017, 12:56 PM

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.

11-09-2017, 12:56 PM	#4
Jim Brierley Senior Member Join Date: Jun 2010 Location: Temecula, CA Posts: 4,087	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.