Didn't hear that Gav, but I did hear from one of his neighbours that he has several versions.
There is the V12.
Then I heard he bolted two LS1's together at the sump flange and made a horizontal X16.
Then, just so no one would be faster at the Shelby fest he bolted two of his V12's together to make a X24.
I've also heard from an excellent source that the left over 4 cylinders from the V12 conversion has gone into an LS V4 which currently powers his ride on mower.
Watch out for that ride on at the next nationals.
