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1995 993 ceramic exhaust ports

Engine

Vehicle Information: Year: 95; Body Type: Coupe; Total Mileage: 45000;

I'm in the process of rebuilding my 993 motor. I'm doing a complete rebuild (to the crank). After I got everything apart I noticed two of the heads had the ceramic lining in the exhaust ports cracked. I then sent everything to the machine to get checked out and they notifed me that the other 4 heads had spider cracking in the lining. I have heard that the spider cracking is not uncommon and not something grave enough to replace all of the heads. Can you please shed some light on this issue for me.ThanksCar Prep: ModifiedModifications: L/w flywheel, exhaust, suspension and seatsTotal Mileage: 45000Car Use: Track only

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