I emailed Hoosier about this, here was the response. I'm still waiting to hear back on how old mine are.

Quote:

Dustin,

Every tire has a serial code embossed into the sidewall. On your tire it is on only one side about 1-2 inches up from the bead. It is a 4 character code. (Example: 5T6S or Y32Z). They are a bit difficult to read so be sure to record the proper sequence. When you have located it, just email Steve Hudspeth (shudspeth@hoosiertire.com) here at Hoosier. He can look up when the tire was produced using this 4-character code. He is also a drag racing product manager who should be able to answer your technical questions.

Thanks!
Kenneth R. Boyle
International Sales/Website Editor/SBU




-Dustin
67 Dart, 9 second, 392" G3 Hemi
68 Barracuda 340 F/SA