royalcrown

what does date code correct mean? the dealer says that this car I'm looking at is "date code correct" and explains it as a metal tag on the motor held on by a bolt. he also mentioned that a lot of these older mustangs are missing this tag.

Starfury

He is correct. Ford didn't really start stamping partial VIN's on blocks until '68, iirc, and they weren't exactly perfect with it when they did start. Before then, it was rare to see a partial VIN on a block. Most of the blocks that do have stampings are K code 289's (and related Shelby motors), BOSS blocks, and 428's.

Without a VIN stamping, the only way to tell if parts like the block and heads are correct for the car is to check the date code stampings and ID tags. Most engines are missing the tags, so you get back down to the date stampings, which are usually (but not always) 2-4 months behind the production date of the car. If they match within reason, the part is considered 'date code correct.'

Nabster

You can think of it as the Ford version of "numbers matching." Doesn't carry the same weight, but generally the same idea.

MIL1ION

In Layman's terms... The components of the car installed have to be with a certain time line BEFORE the vehicle was assembled.
Engines,Trans,Window Glass,Interior,etc are date coded for creation.

aka: You can't put a 1967 engine,trans,etc in a 1965 car