From the date stamp of '81 on the heads, it appears that you have a late SC motor. On the SC you need to count the fins on the cylinder to tell the difference.
Nikasil and Alusil
11 fins = Nikasil
10 fins = Alusil
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Tom Butler
1973 RSR Clone
1970 911E - Sold but Never Forgotten
914-6 GT Clone
Last edited by tom1394racing; 06-15-2009 at 02:36 PM..
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