[bpitts]

What block had the YYY stamped on it ? Ive seen the XXX blocks but not this one ?

 

[Smitty331]

all i know is that the XXX blocks are roller blocks...

 

[FoxChassis]

all i know is that the XXX blocks are roller blocks...

Not really.

I've personally decoded a block from an '84 Crown Victoria that had "XXX" in the lifter valley. Roller blocks didn't come out until '85, and only in the Mustang and Capri in that year. Crown Vics didn't get roller blocks until at least a year after that.