IK20TT — Denso Iridium TT Twin Tip Spark Plug
Part Number
Denso IK20TT (Denso part 4702). Iridium TT series. [Verified — Denso, Amazon, multiple retailers confirm 3UZ-FE fitment]
What It Is
Spark plug for the 3UZ-FE 4.3L V8. Twin-tip design: 0.4mm iridium centre electrode + 0.7mm platinum ground electrode. V8 requires 8 plugs.
Specifications
- Gap: 0.040”
- Thread: 14mm
- Reach: 17.5mm
- Hex: 16mm
- Lifespan: 60,000-100,000 km (iridium)
Fitment
SC430 (UZZ40) 2001-2010 with 3UZ-FE. Also fits LS430, GS430, LX470 (2UZ-FE). [Verified]
Where to Buy (Australia)
- Automotive Superstore — A134 total.
- eBay AU — search “Denso IK20TT” or “Denso 4702”
- Amazon
Service Notes
- At 153,081 km (Leif’s car, April 2026), plugs may never have been changed — likely overdue
- No need to stockpile — IK20TT fits dozens of Toyota/Lexus models and will remain available for years
- Integrated crush washer — no separate gasket/seal needed
- Torque: 18-21 Nm (13-15 ft-lbs) — do not over-tighten, iridium ceramic is fragile
- IK20TT is an upgrade over factory SK20R11 (twin tip vs single tip) from the same OEM supplier
Related
- Braking System (often serviced together)