What is the heat range rating on this plug?

Here is a comparable heat range chart: https://www.densoproducts.com/learning-center/article/225/heat-range-conversion-chart, obviously this is a 20 plug.

Are these denso (4709) iw20tt spark-plugs delivered "pre-gapped" to the customer?

As in any spark plug (SP) user, you should always check the gap. The same SP could be used in different engines and/or applications. So, BE EXTRA CAREFUL GAPPING these SP because the center electrode is .040 in dia. Will snap off very easily. I put them in a vice with vg light and carefully gap to what I need. I use non-nickel anti-seize on the threads whether the heads are aluminum or CI. Torque to factory specs. Good luck

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⚡ Ignite your drive with DENSO’s cutting-edge twin tip spark plug!

BUILT TO LAST - All-around laser welding ensures durability under extreme driving conditions—drive with confidence.
EMI NOISE SHIELD - Embedded resistor blocks electromagnetic interference, protecting your vehicle’s electronics.
TWIN TIP TECHNOLOGY - Double needle electrode accelerates flame development, boosting engine power and throttle response.
FUEL EFFICIENCY UPGRADE - Optimized quenching effect means better combustion, saving fuel and cutting emissions.
PRECISION IGNITION POWER - Ultra-fine 0.4 mm iridium tip reduces spark voltage for lightning-fast starts.

The DENSO Iridium TT IW20TT spark plug features a precision 0.4 mm iridium center electrode and a 0.7 mm platinum needle-type ground electrode in a twin tip design. Engineered with all-around laser welding and a built-in resistor, it delivers superior ignition, improved acceleration, enhanced fuel economy, and long-lasting durability for premium vehicle performance.

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Manufacturer	DENSO Corporation
Brand	Denso
Model	IW20TT
Product Dimensions	8.5 x 2.5 x 2.5 cm; 65 g
Item model number	IW20TT
Manufacturer part number	IW20TT
OEM Part Number	0948200154, 101000002AE, 101000047AB, 1UD118110, 1UT118110
Position	Centre
Item Weight	65 g

DENSO Iridium TT Spark Plug - IW20TT - Twin Tip - The Powerful Premium Quality Ultra-Efficient Replacement Plug Fits Fiat Mercedes-Benz Honda MG Nissan Porsche Renault Subaru VW Hyundai Daewoo Lotus

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