whats the size of the combustion chamber stock aluminum LT1 heads

 

Most LT1 owners will agree that the heads have 58 cc chambers, but there appear to be a few who will argue that they are 54 cc's. The only way to know for sure is to cc them yourself or have someone do it for you. Here's a helpful link...it was written for an outboard boat motor, but the same principles apply for an automotive head.

http://www.hydrostream.org/ArticleArchives/CCHeads.htm