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Is it a myth that XXX blocks have a higher nickel content in their casting than the YYY blocks making them stronger?

The Warhorse as I got it.

Electric work in progress.

Electric work in progress.

Electric work in progress.

Empty engine compartment as I got it.

Empty engine compartment as I got it.

There is no problem I want to know because I've never seen a block without any identifying marks!! And YOU'RE confused!!! LOL

No numbers behind the engine mount either. This is why I'm completely in the dark on it. I've got so many different year parts in the engine while rebuilding it,I guess it really doesn't matter. Was just looking for clarification,had never seen a "not so defining" block from Ford before. Ran...

Another problem.....The 91 GT that the engine come out of was totaled 5 years ago. I bought the engine,being that it was the only thing unharmed from a rollover crash and fire. I've got an 87 5.0 liter GT 5 speed that I use for 1/8th mile duty,that's where the engine now resides.

My interest is knowledge...plain and simple. Wasn't implying that XXX was a replacement. If it's a possible original then why NO partial VIN code @ the rear of the block? There are no grind marks and I've switched it over to carb. I looked it all over before taking to the machine shop and...

That's the problem...there aren't any stampings in/or around that location. Only codes on the block are what I posted and the XXX inside the lifter valley,and it is a roller block. I was under the impression that it was a replacement engine. Maybe warranty issue,not sure...

Thanks for getting back with me so quickly!!! :) That's what I had initially thought Mustang5L5. After going through several decoding sites and even reading that Ford didn't cast any newer blocks until the 94- 95 model years?, that the numbers on my block actually was used for 91-93. Was even...

It came out of a 1991 GT,but don't think it's original. I can't find a positive answer anywhere!!!