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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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Old 08-08-2007, 10:36 PM
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FordMustangXBA
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Default 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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Old 08-08-2007, 10:59 PM
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FullAuto
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Default RE: Casting mark question...
Not all, but the ones that are XXX are roller blocks. Some are YYY.
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