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Discussion Starter · #1 ·
I've been following the tread about ticking Pentastar and new head replacements, and I must say I am totally confused between AA, AB, Ac Heads and weird dates that some call "Julian" (I guess it's opose to Gregorian calendar ?).
I have 2013 JKUR. Manufacturing date is August 2012.
Does anybody know what head is in my engine, or any way to verify it ?
Do we know of any case with ticking on 2013 ?
Thanks.
 

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My 2013 is earlier than yours so I wouldn't worry.
 

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don't worry about it if you don't have a problem. if you look at your driver's side head from the fender near the brake booster, you can see a stamp that has three lines. the first line is the build date in julian.

anything past (206)12G is an AC head, which is the latest
 
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