Something to note - the BHC has the EUN listed as 343699, the EUN on the December cast XS block I picked up is 448144 - over 100k units later! My XW cast C118 was put in the June 24 invoiced car. These motors were produced well in advance of the cars they went in.
Thanks for the math work there BVZ.
Even though the Voodoo Green car ended up a I.