Hi Steve:
We are going to have to rewrite that book I think for them.
See I am still 100% convinced they made a 4 bolt 512 oval port since I sold one undrilled for oil cooler and seen two pictures of others since. The Judge may say no but I know now what I had.
With this 854 block the first link would not suprise me to be wrong but not the nastyz one or I have found at least three other lists the same.I still have some 402 and early 454 blocks that are not 512 but they are buried.
I will see what else I can locate also and between us we will figure this one out. take care
Joe