The 3924704 tag is a bit of a "sleeper" in the Muncie world—highly prized by those in the know, but often overlooked because it wasn't the standard high-volume tag for the Camaro SS or Z/28.
Aside from its primary association with the L79 engine (327/325hp), this specific ID tag was used on a handful of other high-performance 1968 Chevrolet applications.
Where Else Was Tag 3924704 Used?
In 1968, this tag identified an M20 Wide Ratio transmission matched with small-blocks that required a specific torque capacity. You would find it on:
1968 Chevelle SS (L79): The L79 was a legendary "underrated" engine in the Chevelle lineup for '68. Cars built with this engine and a 4-speed almost always carried the 3924704 tag.
1968 Chevy II / Nova (L79): The Nova was a lightweight powerhouse with the 327/325hp combo. This tag is a "correctness" requirement for any Nova L79 survivor.
1968 Corvette (L79): While many Corvettes used the M21, those ordered with the M20 wide ratio and the base high-performance 327 often used this same identifier.
1968 El Camino & GMC Sprint: Specifically those equipped with the L79 or, occasionally, the early L48 (350/295hp) engine package.
Will ship to lower 48