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Old 05-09-2002, 04:33 PM   #1
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Question XXX or YYY stamped on 302 blocks?-what does it mean?

I say that it has something to do with what plant made it or what year the block is. My friend says that it has to do with the casting of the block. Does anyone know what these marks mean? they are found on the lifter valley just below the lower intake. I have seen either YYY or XXX......thanx for any info..........Doug K
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Old 05-09-2002, 06:06 PM   #2
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Old 05-09-2002, 06:33 PM   #3
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I brought up this question once and the concensus was that the XXX motors came out of mustangs and the YYY motors came from LTD's. This was only through a small bit of research so it could be wrong. It came about when we suspected a crooked mechanic swapped motors on someones Mustang. The motor had YYY in the lifter valley. Well, all the 302 blocks, that came from Mustangs, that my buddy has in his barn say XXX and the ones from LTD's said YYY. Like I said, not very thorough research, but it was enough to get the mechanic investigated.

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Old 05-09-2002, 08:26 PM   #4
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Old 05-09-2002, 08:44 PM   #5
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Quote:
Originally posted by DeviousVert
I brought up this question once and the concensus was that the XXX motors came out of mustangs and the YYY motors came from LTD's. This was only through a small bit of research so it could be wrong. It came about when we suspected a crooked mechanic swapped motors on someones Mustang. The motor had YYY in the lifter valley. Well, all the 302 blocks, that came from Mustangs, that my buddy has in his barn say XXX and the ones from LTD's said YYY. Like I said, not very thorough research, but it was enough to get the mechanic investigated.

not true, I am looking at the stock block out of my 90'lx and it has YYY in the lifter valley.I know for a fact that this is the stock engine that came in this car from the factory.
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Old 05-09-2002, 09:12 PM   #6
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oh well, so much for my theory
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Old 05-09-2002, 10:01 PM   #7
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Quote:
Originally posted by brad
yyy blocks are for anyone!!!!

xxx blocks are for anyone over 21!!!!!!

lol
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Old 05-09-2002, 10:09 PM   #8
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I had a YYY block that didn't have the two holes in the lifter valley.
The bungs were there, but not drilled nor tapped.
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