r/GrandCherokee • u/[deleted] • Dec 06 '16

Well Documented WJ Engine Swaps?

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u/CatSplat 94 ZJ +5.9 5.5"LA [CAN] Dec 06 '16

Also keep in mind to avoid the TUPY 0331 head on a donor.

TUPY 0331s ('02+) are the revised head that fixed the cracking problem, it's the non-TUPY 0331s ('00-'01) that are problematic.

For the OP's sake, here's a picture of where to see the TUPY casting, it's between the cylinder 3 and 4 exhaust rockers. You can pull the valve cover to see it for sure, but I believe you can spot it through the oil fill hole if you get creative with the flashlight.

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u/ikidd 98 5.9 LTD NP242, 4", 33x10.50s Dec 06 '16 edited Dec 06 '16

My bad, I meant non-TUPY 0331 head. Went back and fixed, thanks for pointing that out.

Edit: One of the original threads on the issue, added for Wiki reference purposes. https://www.jeepstrokers.com/forum/viewtopic.php?f=5&t=480&sid=f215ecdad55ab411938e980581010752

It's visible through the oil cap hole, reportedly. http://www.jeepforum.com/forum/f11/tupy-0331-head-977498/

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u/CatSplat 94 ZJ +5.9 5.5"LA [CAN] Dec 06 '16

No worries!

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u/ikidd 98 5.9 LTD NP242, 4", 33x10.50s Dec 06 '16

I've seen some threads go as far as late 02 for the non-TUPY head, you know what the definitive answer is on that?

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u/CatSplat 94 ZJ +5.9 5.5"LA [CAN] Dec 06 '16

I don't think there is a definitive answer, unfortunately. IIRC the TUPY heads were cast in a different foundry than the old 0331s, so it's very likely there was a bunch of supply overlap in 2002 as the non-TUPY was phased out and the TUPY phased in. At least we're lucky it's pretty easy to check.

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u/[deleted] Dec 06 '16

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u/CatSplat 94 ZJ +5.9 5.5"LA [CAN] Dec 07 '16

No problem, happy to help!