Coolant leakage into cylinder is usually either head gasket or intake manifold gaskets. If intake gasket there may a little coolant in the intake valve area. Takes close inspection.
These heads can easily warp even when removing them as you were supposed to loosen the head bolts a 1/4 turn at a time in the same pattern as you torque them until they all are loose. I kinda doubt you did this.
Check for cylinder head warpage. Maximum allowed spec'd at .002". Also note following torque info.
View attachment 54714
Can be check for using a flat pane of glass and very light weight oil. Also can flatten using the same pane of glass and very fine grit sand paper. If warp too bad replace the head in question.
Do not reuse the installed head gaskets.
Head 1 torque pattern
View attachment 54715
Head 2 torque pattern
View attachment 54717
Download the engine's service manual for info on re-assembly procedures.
