When building a custom engine ... plugs is 14 mm, although a few older Ford engines used the larger 18mm size back in the '60s. Thread reach does vary, but the two most common flavors are the ...

Correctly gapped spark plugs burn hot and will not cause the engine to misfire (knock) under load. Regardless of whether a plug has a close or wide gap, if it doesn’t fire consistently ...

Keep in mind this may require more than eight spark plugs to index an entire set of plugs for a V-8 engine. The post Tech 101: The J-Gap Spark Plug Advantage appeared first on The Online ...

Odds are that as you touched the wire, another part of your body was in touch with a metal engine part or body component, creating a more desirable path to ground than the gap of the spark plug.