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.

piston markings ?????????????????

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Old 03-05-2007, 12:06 AM
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immr.mustang
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Default piston markings ?????????????????

[i] was looking into the cylinder with a boroscope and saw some markings on the pistons that looked like 'E77a' or very close to that. anyone have some clue as to what these pistons might be??? I remember my 91 said trw on them... e77? stock fomoco's?[/align]
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Old 03-05-2007, 12:25 AM
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SSKiller
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Default RE: piston markings ?????????????????

What year is it?
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Old 03-05-2007, 12:36 AM
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immr.mustang
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Default RE: piston markings ?????????????????

not sure. the guy I bought the car from told me that it was a 306, and im just not so sure now after seeing those markings along with the oe style 4 valve reliefs in them.
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Old 03-05-2007, 12:37 AM
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immr.mustang
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Default RE: piston markings ?????????????????

the car is an 89, but i do know the engine was swapped
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Old 03-05-2007, 01:06 AM
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ZachW04Stang
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Default RE: piston markings ?????????????????

E7 pistons were in all 87-92 mustangs.
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Old 03-05-2007, 01:08 AM
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immr.mustang
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Default RE: piston markings ?????????????????

ttt
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Old 03-05-2007, 01:15 AM
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immr.mustang
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Default RE: piston markings ?????????????????

is that(e7) actually stamped on top of the piston though? i just dont remember that being on my 91, i remember seeing 'trw'
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Old 03-05-2007, 01:17 AM
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rmodel65
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Default RE: piston markings ?????????????????

ford used trw on the 5.0ho
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Old 03-05-2007, 01:26 AM
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immr.mustang
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Default RE: piston markings ?????????????????

the question is......... does anyone know what these pistons were oe in.... if they even are... just trying to figure out what this engine is without taking the heads off first.... im fixing to put a set of performer rpms on it and was just seeing if anyone was familiar with this particular piston stamping.
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