Looking at a 340 cuda and door sticker has it as a 2-70 build on car. When I look at engine block what should the date as far as month and year be on the block? Thanks in advance.

What are the numbers on the front of the block below the driver's side heard surface?

One of my cars had 417 on the fender tag, 4-70 on the door sticker but the original engine was assembled 4-22-70.

Thanks for the info. My buddy that was with me is a ford guy and he said mustangs engines were 2-3 months before car.

First thing you do? Forget anything a Ford or GM owner tells you! While there may be SOME similarities, Mopars were generally pretty unique.

Like Barry eluded to, there's no set rules when it comes to scheduled production dates and engine assembly dates, just generalizations.

Two things you can count on for 99.99 certain. The engine assembly date is the ACTUAL date it was assembled, and the month reflected on the door sticker is the ACTUAL month the car was completed. However, the cars Scheduled Production Date may have varied (usually by a few days, but possibly even weeks or months!). Also, various engines seemed to be cast and assembled at varying times before being used in production, some were years appart while others were mere weeks.. Generally speaking 340's were cast and assembled fairly quickly, usually a month or two after being cast, and USUALLY made it into cars within a few days to a week or so depending on the shipping times to the various assembly plants.

Mopar casting dates can be dated years before used in a car. The assembly date of the engine itself may vary quite a bit, either before or after the date they hoped to build the car (SPD).

Re-stamped blocks, fake fender tags, broadcast sheets & door stickers are out there, so if you are not sure what to look for, find someone to help you out that knows how.