5.2 magnum options

compression check was ok 150+ on all cylinders dry and cold even.
just pisses me off I had the pan, intake and valve covers off and peeked around all looked good. should have suspected something when even the guy who rebuilt the heads said this was the first set of magnum heads he didn't find a crack in at least one head. I have a feeling the 8,000 miles were very Hard miles.