Problem is, the heads were ported/ polished and had larger valves installed. Then I had them flowed and based upon that #, had a custom cam ground. Now, if I change heads, and don't get the exact flow.... Should have left well enough alone. But I read that using unleaded gas you're supposed to have hardened exhaust seats installed. I tried to do it right, but ended up ruining a set of heads.

The work was guarenteed, that's why the shop is going to fix/repair them. However, I'll have to ask them how long they'll warranty the work once the repaired head is in and back in the boat running high revs. This is a supercharged engine running ~max rpms of 5,500 or so. I definitely don't want salt water in my engine, luckily I was only running it in a lake for break in and hence only got fresh water in the engine.