Or instead of theoretical discussions, you can try the experimental method. Just put the block in - on my Insight it's just a piece of coroplast that slides between the radiator and the A/C condenser - and see if the engine warms up faster. It does on the Insight - on a cold day, it takes about 5 miles of the road into town to hit 195F with the block, without it takes 10-12. YMMV, of course.
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