That is odd... just emailed with Dave the other day and said he could open it up. Now going to heart shape was assumed since that is what the website says, but not clear in his email.
From July 12th:
"Yes I can open up the chambers to 87 or bigger cc’s. It does require having to cut the valve seats as part of the program is I trim the top of the seats about .050” to make the chamber larger so the installed height grows by about that much as well. To machine the chambers and cut the valve seats you’d be looking at $375.00"
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