Drain the oil and put in fresh. Drive around for a bit and if you have it there still, do a compression test and if that passes, pressure test the cooling system.
Sounds like a HG or a cracked head but you can't tell without testing it
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1988 Mustang LX
Ex 2.3 N/A car, was a 2.3 turbo, now getting a complete forged & stroked 408W, shooting for a TT setup
1992 GMC Sonoma 4x4
185,000km's|4.3 auto|current DD getting 24mpg
1991 Mazda MX6 DX
299,000 km's (over 186K miles)| TOTALED!
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