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that's what I was thinking I was expecting it to still look fresh inside, and very disappointed and discouraged to build another.

NO to the hardened seats. Only as a last resort to save a scrap block or head. Something for a used car lot to maybe do.

I thot maybe yours split becaause of a hardened seat installed.

which engine is it??? The 288??? i'm not familiar with the 48 models altho i do own a 48 2262 as a parts car.

Very unusual to crack at an intake valve seat; from my own experience 99% of internal cracks occur starting at the exhaust valve seat and if not properly repaired, slowly progressing to the cylinder bore and then down the bore. Cracks of this sort are primarily the result of severe and constant overheating, perhaps exaggerated by adding cold water to an overheated engine. A plugged water distribution tube can also be a contributor.

As to hardened valve seats, never on the intakes. If you plan a steady diet of keeping up with traffic on Interstates at 70 or higher speeds, you should think about hardened exhaust valve seats or stainless steel exhaust valves. Otherwise no.

its a 327 I have never had to add water to it when its been hot.I have an overflow tank on it so I don't loose any coolant when it dose get warm. I don't have an overdrive so I normally drive it around 55mph on the freeway 65 max but not for long periods. I have babied the car since iv gotten it on the road. I'm hoping this isn't a common problem I liked the straight eight and planed on building another for it. thanks for clearing up my valve seat question