3.0L twin plug - second plug doesn't fit

[Henry Schmidt]

Originally Posted by Walt Fricke

A bit crude, but you could add a washer.

Spark plug washers have some mystery to them. Some authorities say you should use new washers each time you have the plugs out. The regular plug washer is a crush washer. But I have never been able to find a source of these washers, and you have to cut the old ones off.

But for this (in a pinch), any copper or even aluminum washer of the right ID to slip over the threads should work.

This is the first time I have seen a reputable source show a reason to use one of the multiple electrode plugs. Looks like the right solution.

Race shops sell indexing washer of varying thicknesses designed to allow you to point the electrode in the "proper" direction. I never figured that out in a hemi head but the washers are available.