TR55's pregapped?
 

I was just wondering if they come gapped?

TIA

yea mine came like they should gapped at .55 I think it was, but double check them b/c someone could drop them or something and it could mess the gap up. But generally they do come gapped where you need them

I always double check the gap before they go in

Best practice for sure, they usually range from .052-.057 out of the box in my experience.

Mine came out at .044" average today. Went in at .058". Take 5 mins and set them up as you require.

set them any where from .040 -.050 on an bolt-on ls1

TR55s are supposed to be gapped at .055. But as posted above, actual gap is usually a little off.

The rule of thumb, is that no spark plug comes pre-gapped ;)

i think they're supposed to be pre-gapped at .55 but most people run that at .50 (or even less) for mildly bolted on cars. i'm gonna change mine later this spring and will prob set them ~.50

Seems like I just came across some information that indicates that that has changed. I think they now come in somewhere around .044-.045 due to a manufacturing change.

so, is that where they should be gapped for a bolt on LS1?

This is very possible. Recently they started producing them with fixed tips on the plugs, no longer screw-on type.

They should be at .050-.055 for a bolton car.

The only ones you can't jack with are iridiums/platinums. It's a good idea to make sure they are all "even" and there's not one made on a monday that got thrown across the spark plug plant. If you find a bad one, take it back and swap it.

If you already knew this, consider it a heads up for others. :)