That’s the secret even on the Fords. Warm it up to operating temp. It might be a bit rough on the chevy with the engine hot but not the Ford.Oh, and word to the wise on leaving spark plugs in for 220,000 miles. I don't recommend it at all, but I REALLY don't recommend it if you have aluminum heads unless you really, really want to try out helicoils. Luckily, my old 5.3L is the all iron version, so the plugs came out surprisingly easily (had to warm up the truck for 1).
Use anti seize.