Mopar 413/426 Max Wedge block casting number confusion

Josh owen said
I can vouch though I found a 413 in a 67 imperial which the 413 did not come factory in a 67 imperial. The ID pad was blank but the casting number was allegedly the same as a max wedge block I cant recall the year the block was it's been 5 years but i know buyer was very happy a week after buying it and And pulling it apart for a refresh and it was a .060 413..... i dont know how or why it was in the 67 imperial but I've pulled hundreds of engines and i have no doubt it was factory install or someone swapped it in and did everthing 100% correct. not one single hose clamp was wrong or incorrect either. Really wish I would have hung onto that one. I have also found a 340 in a 72 dodge van before. Van looked 100% stock as well even the underhood decals showed it was a 318ci. Makes you really wonder how and why and if these left the factory this way.

Anything is possible back then. But this is why most professionals documenting and verifying these max wedge cars go by the rule of three, that being the casting number, the AAQA, and the notches. The dizzy pad usually is looked at after those three because it’s easy to stamp a dizzy pad. Much harder to take a casting number.

Plus, after they left casting, the blocks for max wedges were sent to a special performance engine division to build out. Some blocks were rejected for various flaws that later were corrected and reused elsewhere. So it’s not uncommon to have one with the right casting number but not notches or dizzy pad information.