Fitting C5 plugs

[yellowshark454]

About to fit a new set of plugs and a Corvette forum article recommends applying a light coating of anti seize compound to the plug thread. My local normally good motor factors has not got annthing. Anyone have a brand name I could go in search of?

[Boosted LS1]

Copperslip or similar will be ok.

Boosted.

[yellowshark454]

Yup just found that on the Web. BUT have also just found article where suppliers like NGK, AC Delco, Autolite suggest this is not a good idea as the lubricant will cause over torquing and suggest if you do do this you should reduce the torque by 40-50%

Christ what happened to the simple days when you used your fingers then gave them a bit of a belt with a wrench and left it at that. And then found at some future date you could get them out again.

[franv8]

I don't think I've ever put anti-seize on plugs before, and that includes cast iron, aluminium, water and air cooled (only VW...) heads, but it's good practice especially if you're not going to touch them for an eon...

Anyway, in situations where torquing to a preset value would not be reliable, i.e. here, then angular torque overcomes this.

For a plug with a flat seat and fitted washer (it'll be a soft crushable washer) then tighten it until you just sstart to feel resistance (i.e. washer makes initial contact with head) and then turn a further 90 degrees.

For a taper seat plug (no washer, but shoulder just above where thread ends will be, er, tapered) again tighten until it just makes contact, then give it a mere fifteen degrees of twist.

Hope this helps

Francis.

[Yellowshark454]

OK now have my Denso IT20s. Want to get them on so I can leave Richard at the lights. But...

I come from the school where you set plug gap by tapping it robustly on the drive and then use the feeler guague to nudge the gap back out to the required size. Looking at these Iridium cores, they look as if a gnat wouldbreak them if it sat on them.

Anybody gapped one theses plugs or similar before?

[LuS1fer]

Buy a spark plug gap adjuster, you heathen! It's like a little cutout that you slot onto the arm of the plug at the bend and adjust bend up or down. Then you can keep it in your toolkit with your hammer! LOL.

[yellowshark454]

God they think of everything these days don't they. I have to get one of those, a mere pittance I suspect against the cost of the Densos, and like me the hammer is getting on a bit!