the pump won't feel too stressed about that. but if u don't have the flow to match, the airbubbles might feel all to happy taking care of some nice mood effects and dance in your tubes; instead of being blown into your airtrap or res. that is the only possible problem i know u could encounter (which you wo'nt encounter +/- if u go from 1 0.5" to 2 3/8"s in a Y). don't expect much good from mounting your rads in parallel though. if you're lucky, you will get about 1°C of difference.
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