How to identify 0331 or TUPY head

Hi everyone, I've searched for this and haven't really found any good answer. I have an '01 tj with the 4.0 engine. I would like to find out how to identify what head my engine has on it. I've read that the heads labeled 0331 are prone to cracking and that they were changed to a head labeled

No numbers stamped on my head. (TUPY, 0331) 2001 TJ

Recommendations on new head? And another question

Very Good, condition: like new, make / manufacturer: Tupy, model name / number: 0331, This head just come from the machine shop tested for cracks,

Jeep 4.0l Tupy 0331 Rebuilt Cylinder Head for Sale in Shreveport, LA - OfferUp

Original Head Replacement with new Clearwater. A relaxed day of

Is this the cylinder head that cracks?

Welp. 0331 woes. : r/CherokeeXJ

Cylinder head casting differences throught the years? - Jeep

Welp. 0331 woes. : r/CherokeeXJ

No numbers stamped on my head. (TUPY, 0331) 2001 TJ

Installed a Clearwater 0331 cylinder head this weekend : r/CherokeeXJ

Clearwater Cylinder Head Clarification Needed (0331) Head Swap In

How to identify 0331 or TUPY head

the 0331 head thread (help out if you have one!) - Page 5 - Jeep

How to identify 0331 or TUPY head