2000 jeep wrangler 4.0 cylinder head

I possibly may need a cylinder head for my 2000 TJ. I already have a TUPY cylinder head on the block already. If you was buying a Cylinder head what would you buy? If my TUPY is cracked to my cylinder #3 I will be disappointed. Do I get another TUPY head? What I have been looking at is a new casting PROMAXX, Clearwater, or another rebuilt TUPY. My current set up is a TUPY head that I put on about 15,000 miles ago with a FELPRO MLS head gasket and ARP head studs. The original head wasn't cracked and worked fine but I had oil leaking between the head and block and figured since I had the head off I would replace it with the head that is less prone to cracking. I haven't tore into the engine yet but the dealer bore scoped and did a leak down that checked out good. They said #3 piston is clean while the other pistons have typical carbon build up. Sounds like a coolant leak right? I haven't noticed the coolant level dropping which lead me to believe that I didn't have an internal problem after a compression check. The dealer pressurized that cylinder and didn't even get bubbles to come out of the radiator either. They said the plug had a green tint as well. I hope that it's just a head gasket but looking at heads too. When I pull the head I will figure it out and hope for some odd reason the block didn't crack. I'd like to know where the PROMAXX head is casted. My understanding is Clearwater is casted in China. Tupy was casted in Brazil. Also there is an American version or maybe Canadian version of the TUPY head which thicker casting but not as easily identified because it didn't have TUPY casted in the head.

Get tupy that says tupy

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I've never seen or heard of a Tupy head cracking. If it isn't stamped on it, it isn't one.

Hoping its just a head gasket. fingers crossed. My head on my Jeep is a TUPY . It says TUPY. Anything is possible.hoping it's not cracked but who knows. My understanding that the company in Brazil that casted for these heads for Chrysler is called TUPY. There was also another company in North America that casted the same head but wasn't TUPY and any 4.0 04-06 was the thicker casting. Just from internet reading and the internet doesn't lie. How many blocks have you heard of cracking around one cylinder??

No other company has cast TUPY heads. TUPY is the name of the foundry in Brazil, they are the world leaders in Cast Iron Engines. TUPY is the foundry for Cummins as well. Promaxx & Clearwater/Odessa are both the same casting. It is a Chinese casting that Alabama Cylinder Head brought to the market. When Alabama went out of business Clearwater bought a bunch of their heads and some guy bought the facility and named it Promaxx. Promaxx castings are all Chinese yet machined and assembled in Alabama. Then of course you have the Edelbrock Aluminum head. Even though Edelbrock dropped the price recently, it's still wildly overpriced. Then consider the modifications that need to be made for install on a late model 4L Jeep.

No other company has cast TUPY heads. TUPY is the name of the foundry in Brazil, they are the world leaders in Cast Iron Engines. TUPY is the foundry for Cummins as well. Promaxx & Clearwater/Odessa are both the same casting. It is a Chinese casting that Alabama Cylinder Head brought to the market. When Alabama went out of business Clearwater bought a bunch of their heads and some guy bought the facility and named it Promaxx. Promaxx castings are all Chinese yet machined and assembled in Alabama. Then of course you have the Edelbrock Aluminum head. Even though Edelbrock dropped the price recently, it's still wildly overpriced. Then consider the modifications that need to be made for install on a late model 4L Jeep.

Ok. Thank you for clearing some stuff up. I did not know Promaxx and Clearwater were the same casting. Was there a year that all 4.0 heads were Tupy or heavier casting? I have an 04 Grand Cherokee for spare parts and it does not have a TUPY head. I also did not know that the Cummins heads were cast by the same company. I have a 5.9 Cummins common rail that is currently waiting on a cylinder head due to their prone to cracking. Good friend of mine has a 6.7 Cummins and he recently put a new head on it cause his old one was cracked. I don't know the history of his, but mine has never been over 218 degrees and with my TUPY head on my jeep never being over 224 degrees and don't really run them hard at all. Surely that's not hot enough for a head to crack. It will run around 203-206 in the summer with a 195 thermostat. I literally just got back in town from a trip to the San Jaun Mountains in my Jeep and hosed my jeep off along with the engine and it collected a slight miss.

I bought this head Jeep Remanufactured Cylinder Head, Year:99-03 and all seems to work well, though I have not had it long. At $300 on a second Jeep that is just for screwing around on, I figure at the very least I would gain enough know how to act like I know what I am talking about in the TJ forums. Jeep runs great and misfire is gone. I still can't believe it was only $300 including shipping and core return shipping. If it goes bad, I'll either get another one or put in a Golan engine.

I still can't believe it was only $300 including shipping and core return shipping

It's $300 because it's a 0331 head. You know, the ones that crack and spill coolant into your crankcase. For your application it might serve you well though. Just have to keep an eye on the coolant level. TUPY heads are always available on Car-Part for $150.

It's $300 because it's a 0331 head. You know, the ones that crack and spill coolant into your crankcase. For your application it might serve you well though. Just have to keep an eye on the coolant level. TUPY heads are always available on Car-Part for $150.

Millions of 0331 heads didn't crack, though the head that came off mine cracked ever so slightly between the valves on #5. I'm just having a blast tinkering around with this Jeep though. I even reused most of the push rods and all but 2 of the lifters when I put the new head on. I view the engine as expendable but I am also hoping that my cheapo $300 head will last as long as the tires I am about to buy. A 331 head that dumps coolant into an engine with 170,000 miles on has about the same risk to me as a brand new dandy head that cost $700 that is just fine when the bottom of the motor is worn out in another 50k. I looked at all the options and either wanted a cheap head or a blue printed stroker motor. 4-6K is a lot of money for a Jeep I don't yet have an emotional attachment to so I opted for the cheapest option. $300 seemed like a good deal for a head without cracks and valves that seat perfectly, which was the cause of misfire problem on the previous head.