My mega block sticker shows 6/27/07 1-p5007624AB
siamese rough bore 4.19
BM70762
Assembled in USA
DLR 77733
OMC: 092392016

Has Mopar name on block, but hadn't sonic checked it as of yet. It is still as new. I have a set of Diamond B1 4.5 bore pistons I want to install into it to make a 540 eventually. I bought an Indy MAXX aluminum for my 572 B1 I'm installing now. I didn't want the extra weight on the nose of my car. I am told it will go 4.5 but will definately check it first.

My 499 cube indy -1 head engine is a 99 year model block. Indy did all the prep work on it and lightend it for me. I assembled it myself. I don't know what years were bad casts myself