Novusuhu

Hey everyone

I got a 77 L48 with H.E.I. and will install new spark plugs.
Is it recommended to use copper grease on the threads of the spark plugs?
Or is that a 'no go'?

jackson

OE L48 has iron heads ... no grease required ... certainly None that is electrically conductive.

F22

A little anti-seize never hurts IMHO and makes removal a little bit easier. Also silicone dielectric grease on the plug insulator (the white part) sure makes pulling the boots off, far easier next time you have to do it.

terry82

I also do this .

CA-Legal-Vette

Me three, especially with aluminum heads. I’ve started using Motorcraft antiseize instead of the copper stuf. Seems to stay on forever.

7T1vette

I've never used the copper stuff. Is it supposed to be 'conductive'? The ground path for the ignition spark is the spark plug-to- engine block joint. If the copper stuff is conductive AND anti-seize, I'd use it.

Mooser

The copper stuff if electrically conductive, that's one of it's main differences from the "regular"
Add me to the list of a small amount on the spark-plugs, even with cast heads
M

Rescue Rogers

Yes and you only need a little. Antiseize spreads thin and will get all over you and everything else if you use too much. In my neck of the woods everything rusts and quickly, so every nut in bolt that I take apart gets a thin coat of antiseize. I havent broken a bolt or stud since

terry82

if you are having aproblem with everything rusting,i have found a new product [new to me] https://www.fluid-film.com/automotive-applications/ I coat everything with this

theandies

I use copper base on my plugs. That's all we used on small aircraft spark plugs and jet engine spark ignighters. Just keep it off the electrode and a light coating is all you need. I'd never install spark plugs into aluminum heads without it

Rescue Rogers

My buddy uses it on his truck. I need to get some as well

kossuth

Ditto. Always makes life simpler when you have to pull the plugs again. Also helps with aluminum heads with galvanic corrosion

jackson

I'm hesitant to broadly suggest anti-seize on spark plug threads because:

primarily, way too many folk put too much on plugs; too much often migrates into electrodes and shorts them with misfires.

I've been using anti-seize more than 40 years; all I've used has some metallic (conductive) formula. ...
... I've had aluminum heads for even longer (bikes, cars, mowers etc) ...
... way back I learned the hard way about too much on plugs: a kick-only panhead.

Also, I've found some brand plugs have a superior plating which (when New) negates any need for anti-seize ...
... I first found that Bosch did; others finds followed ...
... And some have a crappy plating ... or effectively none at all.

So, if I broadcast "hey I always do it" and some initiate who's routinely wrecking parts-tools follows on ...
... and his motor runs like crap cuz it's anti-seize misfiring ... or won't run at all ... then what?

The link below lays it out well enough ... YMMV ... and I'm Not rick.

http://ricksfreeautorepairadvice.com...-plug-threads/