Likely your heads are warped/loose/cracked. Check torque specs and procedure first, if it's loose, that is likely your problem. IF they are loose, then: Do not run it much at all, before you drain the new
oil and check for more
antifreeze!
If they are correctly torqued, it's warped (more likely with aluminum heads) or cracked (more likely with cast iron) heads.
It could also be a cracked block !
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