Sounds strange Garry, open chamber irons are only around 74cc?? Did you cap-off most of the chamber with a piece of glass or something before you measured? Thinking of the "dome" water creates before it flows over might have something to do with the high measurement?
Anyway, won't spilt hairs over it... its your deal ... and obviously producing some good power.... but may I suggest getting it checked by someone with a burette before decking the block though... you may already be well up, compression wise.
Good luck and keep kicking that "fast" chevy's backside..
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