First off, welcome to the CAC. Take a moment to go over to the New Member forum and introduce yourself and perhaps post a picture or two of your Corvette.
Secondly, there is a Model Center here on this great website with all sorts of great information about every year of the Corvette and is always being updated as information is found out. According to what I found, the 8th digit in the VIN indicates the type of engine in the 1981 Corvette and in this case a "6" means you have the L81 engine.
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