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Passenger side head over heats

Brand new build with all new parts.
351c sleeved back to 0
stoked for a total 402ci
CHI 208 raised port
cylinder head gaskets installed correctly
thermostat validated in water to verify it begins opening at 180
using a stant 180 with a block off plate
air bleeds installed in the back of each head
sk32-541-8 cam
ron davis radiator with sucker fans that starts to get warm
eldbrock water pump with impellers going the correct way
over 3 days of testing, bleeding air out, etc. the passenger side starts to steam after 5-10 minutes and the drivers side is fine.

looking for ideas... disassembled the motor an we're not finding anything obvious. Current thought is maybe some blow by but if so there's no obvious signs.

thanks Rick.
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