Mecum zl1 #30 at Kissimmee

[bergy]

ZL1s are no different than any other muscle car. The original engine makes the car more desirable and valuable. In addition to the usual casting date and VIN stamp, ZL1 blocks were cast and machined in sequence. You could have an NOS 1969 block casting and it may not even be close to correct for a particular VIN. There's more of course.

Word to the wise, don't even bother re-stamping a ZL1 block


I don't recall "cast in sequence" William - but I didn't follow the cores & patterns to the casting plants. The parting lines and flow-offs were altered between nearly every casting run due to air entrapment & porosity. So it's pretty easy to spot blocks from different runs.