When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I believe the reason they say to warm the engine before changing plugs is to reduce the chance of galling the threads, which is more possible with an extremely hot or cold engine.
Secondly, to prevent galling when installing plugs, and making it easier the next time, you should always use never-sieze. In fact, ALL bolt threads on all bolts you reassemble should get never-sieze. I've been using it all my life on everything...it's worth it's weight in gold. And it DOES NOT throw off torque values. (Engine rebuilding manuals instruct to oil all bolt threads to get more accurate bolt torque. Dry bolts bind and you risk under-tightening)
Is it any different from a 2V 4.6L mod motor where they said to do it cold? What are the heads made out of?
Just did mine at around 53K on the clock. Truck warmed up a little bit in the drive over to my brothers house so I could use his driveway instead of playing in the traffic in front of my house. Was rather easy for all of them. Best thinig I did was pull both front wheels and the wheel well liners and had alot of space for the lower plugs on both sides. Also a 5/8 swivel magnetic spark plug socket was great.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.