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just seal off the engine bay at the hood grill and put a belly pan on... all of those improve aero as well and are much cheaper than anything thats going to survive block insulation. line your hood, firewall and interior of the grill with aluminum to add insulation rather than just sealing gaps. might as well coat the belyy pan too. insulating the block itself would mandate taking it apart if the temperatures even get into the 50s otherwise your going to cook the engine. Might look at adding a bypass loop in the radiator for a large thermos to reroute coolant until the engine gets warm.
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