I have a friend looking at a 1998 38' Mares cat with 502s,anyone know anything about them?

Quality

Resale

Performance

There Super Sweet Not As Fast As A Skater/nortec But Sweet And Not Expensive

Donz Jr Mike

Any more info out there on these boats, come on throw me a bone!
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I heard on hp500's you have to rebuild the valve trains every 250hrs