2012 JK- built in June 12, so I think I'm close to line of either AA or AB. Stamp on driver's head 1562B, what do you guys think? I have 4700 miles, and noise seems like normal valvetrain noise. I think a lot people are over sensitive to any sort of tick. My mom's DOHC engine in Lexus is certainly not quiet
1622A head stamp with a build date of june 14 2012
Ive only got 500 miles.
Is this AB or AA?
no one could tell you but chrysler, unfortunately. Allpar said that the AB head was in production sometime between late june-early july. The only number considered "safe" right now is 206 and above. even with AA heads, you may never have a problem..
2012 Deep Cherry Red JKU Sport S - Tickastar, 6 speed, 3.73, Dual Tops
Just in case there is any confusion, the Pentastar engine is built in Michigan & Saltillo (Mexico). Jeeps are built in Toledo. So, it's not like they built your engine specifically for a 2013 using 2012 parts. It's a large production chain so the lag times will inevitably lead to some of them winding up with previous year's engines.
CampThree, looks like you have an AC Head.
"I'm too drunk to taste this chicken." -Col. Sanders
hello all I been wondering about this head issue for a while just stumbled across threads tonight. I have a 2012 jku. the Build Date is jul-12 the MDH is 071306.
so with that information i assume it was built on july 13th at 0600hrs. which would put it close to the 2013 build dates. correct me if im wrong. Now tonight I found this thread and looked at my head numbers on the drivers side as suggested by Blastek. Those numbers look like this
now with that knowlege if im reading the posts right i do not have and AC head, but is the 1882A close enough to the 206 mark to say i have the AB head and not the AA???
I have waited for years to become a wrangler owner and love this jeep thing. have had it for less than 6 months and already adding things. I really dont want my dream to turn into a bad dream. lol
all parts end with two letters. Usually AA because most parts don't get revised. The AB sticker that you can see on the passenger side head is the part number for the plastic valve cover. This isn't related to the part number for the cylinder head, which is not visible on the passenger side because the exhaust blocks it.
Nothing to fear.
He's Right about the Letters. The Letters can and will change like , AB to AC to AD etc...it doesn't change the fact Of Fitment, it just means a minor change has been made, Improvements etc. if Mopar p/n's have been Supersceeded by higher letters then only way to get the lower letters is to find someone with old stock, which if the seller is a good business owner, he should sell that older part at a discount, but not always, they are greddy as H*LL....lol....
Man, I love this forum. As a new Jeep owner you all are great at helping out with information. Hope as I get some experience I can repay the group. I guess I can stop thinking I am hearing something in my engine .
I don't think anyone has dates for the AA to AB change, just when the AC started. The closer you are to the AC date the better your chance for a AB head. I would think they would have run the AB heads for a few weeks minimum but only the engineers know for sure right now.
2013 JKU Sport, billet, auto, 3.73, LSD, 315/75/16 Duratracs on MB 72, 10A springs, Bushwacker flatties