lefty75

Are you supposed to gap denso iridiums or do they come pre-gapped already???

DaveGS4

iTrader: (2)

They should come pre-gapped.

lexforlife

iTrader: (7)

they come pre gapped but if the plastic shield is not on the tip just recheck gap to make sure

RanGer498

ik20's are the plug we want correct? or is it another plug number?

SeattleGS400

iTrader: (1)

Check here:

http://www.densoiridium.com

RanGer498

thanks ..
1998 LEXUS GS400 4.0 L - V8 plug #IK20 gap#0.044

so i was right!

Shogun

Correct - IK 20's. They should come pre-gapped at .44.

BIG word of caution here. If you have to correct gap, be real careful. The tips on the plugs are so small and thin that any pressure exerted on tip during gapping will cause the tip to break off.

I actually damaged two plugs during this process. I finally decided to stop trying to "tweak" the gap and simply put them in as they were gapped out of the box. Best of luck!

BTW, plan on 2 hours for the total time first go around. That includes getting your tools out and final cleanup. I also put some dielectric grease on the plug threads.

Eric

gserep1

Dielectric grease should go on the boot of the coil, just before you put it over the plug, or smear grease on the upper part of the plug before installing it in the head. Anti-seize compound should go on the threads of the plugs prior to installation in the head. The dielectric will do no good on plug threads, as it is designed to increase conductivity, and to keep the rubber boot from welding itself to the top of the plug.

GSEREP1