Dedicated to the Promotion and Preservation of American Muscle Cars, Dealer built Supercars and COPO cars. |
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#24
02-28-2008, 06:34 PM
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Re: L-78 Spark plug choice
The "N" suffix means it's the same 3/4" reach, but only 3/8" threaded, as opposed to the "XL" like the 074 heads got that has 3/4" reach and is fully threaded.
 
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