Yes, a flow advantage on the 4 EXH bowls.
Yes, a reversion-contamination isolation-advantage on 4 & 3 vs 6 & 5.
Yes, a cooler head temperature...in the middle-zone where the fastner shank show surface rust.
Yes, a cooler head temperature...in the middle-zone where the head-gasket shown plastic deformation reflow...and likes to blow.
I think it'sa good idea to Fill our crossovers, rather than blocking plates or leave open.
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