Overall, I don't know that outside temperature makes any real difference in cam break-in, especially if it's around "freezing" rather than being forty below zero. But if it's important to you:
1. Install a block heater in the specified core-plug hole, and let it warm the engine for an hour before you fire it up.
Block heaters are readily available, not all that expensive, and not all that hard to install, although somewhat messy if you don't pull the block drain plug on the side that the heater goes in.
Or
2. Throw a Torpedo kerosene/diesel heater in the shed an hour before breaking in the cam.
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