98 5.7 vortec seems to blow a lot of white smoke. intakes were changed.how do i check for bad head gaskets?

Do a compression check on each cylinder and see which is not the same as the rest.98 5.7 vortec seems to blow a lot of white smoke. intakes were changed.how do i check for bad head gaskets?cylinder leakage test98 5.7 vortec seems to blow a lot of white smoke. intakes were changed.how do i check for bad head gaskets?is there coolant in the oil

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