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Discussion Starter #1
what does the xxx mean in the lifter valley?
my 91 cougar 5.0 has xxx
i also have a 88 ford 5.0 block with nothing in the lifter valley
thanks
mike
 

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Discussion Starter #3
i have a 88 lincoln block that hass yyy
and then a 90s ford truck block with no 3 letter code
butt they are all roller cam blocks
 

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my current block is a porno block (XXX)...did alot of reading on this on the corral and other websites...supposedly just a different casting mark, nothing different in terms of the block.
 
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