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im am not convinced at all on grill blocking .. so im the wrong guy to respond..
then i have had machines melt down and radiators explode on account of improper cooling flows ..
but in the interest of good data i would suggest a 50% block and see if you can accumulate some metrics ie: increased MPG
.. keep an eye on your fan function [ if you have electric fans] .. increase to 75% .. monitor metrics
i have seen guys here running 90% block in summer .. im not seen any metrics on any increase MPG nor any data on engine temps..
but then i have not studied the subject a whole lot
i bet you could do a search on *grill block*
and know a whole lot more
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