That's a good point, and very important. Don't ever remove the plugs from an aluminum head while it's warm - you stand a good chance of pulling the threads out with the plug if you do.
I had no big problem changing them. They're a heckuva lot easier than some that I've done recently. A socket, a ratchet and a 3" long extension removed all six without resorting to any heroics or blood loss.
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ASE Certified Master Automotive Technician w/L1.
ASE Certified Master Medium/Heavy Truck Technician.
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