[ImpalaDave]

Just installed Denso IT20TT plugs as per a recommendation by Marc I found on the forums. Gap 0.045". I was aiming for an NGK 6 heat range equivalent plug as I'm mostly street driving with an occasional pull. They're an iridium/platinum electrode plug - supposedly ideal for wasted spark ignitions. This was my first plug change since acquiring my Z this year - the AC Delco 41-963's were crusty (due to moisture?) and had worn to about 0.053" except one, which was about 0.037" (dropped before install?). Runs noticeably better now.

Plug 8 was much easier to get at than I expected - below is the combination of tools I used to get at the plug. The aluminum welding wire was used to separate the plug socket from the short extension, magnet used to remove the socket and extensions from the hole.