Thread: L-78 Spark plug choice
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Old 02-28-2008, 06:34 PM
Chevy454 Chevy454 is offline
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Default 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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