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Discussion Starter #1
Can someone please tell me how to tell the year of a 5.0 block. Also I have 2 roller blocks and would like to know what the XXX on one, and the YYY on the other, stand for that are in the lifter valley. Thank you.
 

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i have one from 86 and ome form 93 both say "xxx"

i would also like to know difference...i see that you have a 66 and a 90...are the engines those same years alos...maybe yyy is a non roller block
 

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Discussion Starter #7
Block ID

The block with the YYY has a fuel pump excentric- (sp) on the front so I really dont know what its out of... There are a few other minor differences, it looks like maybe a different mold, its a roller block tho... Thanks for the replies.
 

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my 86 block had xxx and had the fuel pump on the front also
 
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