5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

Casting mark question...

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Aug 8, 2007 | 10:36 PM

#1

FordMustangXBA

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Casting mark question...

Do all regular 5.0 HO engines have "XXX" stamped into the sides of the lifter valley? I was doing my intake this weekend and I noticed that, and thought it was peculiar...Figured I'd ask.

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Aug 8, 2007 | 10:59 PM

#2

FullAuto

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RE: Casting mark question...

Not all, but the ones that are XXX are roller blocks. Some are YYY.

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