1998 Subaru Legacy Changed Head Gaskets And Started Had Loud Knocking Noise

1998 SUBARU LEGACY
200,000 MILES
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changed the head gaskets & but when i started it had a loud knocking noise it didnt have before the change.I checked the oil it is good.What could this noise be.
Mar 29, 2013 at 6:14 PM
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JACOBANDNICKOLAS
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Is the engine running normally since the work (other than the noise?) Does it have a misfire?
Mar 29, 2013 at 7:34 PM
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