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Old September 24th, 2018, 17:45
95cherokee96 95cherokee96 is offline
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0331 TUPY head stamp through oil cap?

Ive got a 2000 XJ and read that you could read the stamp “TUPY” on the head if you look through the oil cap with a flashlight. When I look in it is blank and can’t seem to find any markings. Does this mean I have a different head or is it just not stamped on some?
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Old September 24th, 2018, 19:05
RCP Phx RCP Phx is offline
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Re: 0331 TUPY head stamp through oil cap?

My 2000 (bought it new off the lot) when I tore it apart to build my stroker, did not have any stamp. It's the same ported/polished head I'm running today.
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Old September 24th, 2018, 22:04
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lazyxj lazyxj is offline
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Re: 0331 TUPY head stamp through oil cap?

Cherokees never were equipped with a TUPY head, they were not manufactured until 2002 or 2003 and are found on TJ and WJ 4.0 engines .
Pics here.
https://www.jeepforum.com/forum/f22/...ml#post9187589
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Old September 29th, 2018, 05:06
md21722 md21722 is offline
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Re: 0331 TUPY head stamp through oil cap?

Quote:
Originally Posted by 95cherokee96 View Post
Ive got a 2000 XJ and read that you could read the stamp “TUPY” on the head if you look through the oil cap with a flashlight. When I look in it is blank and can’t seem to find any markings. Does this mean I have a different head or is it just not stamped on some?
The original 0331 heads were not TUPY.

Quote:
Originally Posted by lazyxj View Post
Cherokees never were equipped with a TUPY head, they were not manufactured until 2002 or 2003 and are found on TJ and WJ 4.0 engines .
Pics here.
https://www.jeepforum.com/forum/f22/...ml#post9187589
This.
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Old March 21st, 2019, 07:46
pats2001 pats2001 is offline
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Re: 0331 TUPY head stamp through oil cap?

I just did the valve cover gasket on my 01 yesterday and looked for the 0331 that's supposed to be visible looking through the oil fill hole but nothing. Did find the 0331 number outside the valve cover surface on the drivers side of the head. Why wasn't there a casting make between the valves?
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Old March 21st, 2019, 08:31
RCP Phx RCP Phx is offline
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Re: 0331 TUPY head stamp through oil cap?

My 2k didn't have those markings either.
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Old March 21st, 2019, 10:13
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Re: 0331 TUPY head stamp through oil cap?

All XJ 4.0 head casting numbers are located at the edge of the casting and are plainly visible with the valve cover installed. Only the TUPY casting mark is located near the valve springs and it is visible by looking into the oil fill cap.

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Old March 21st, 2019, 13:46
denverd1 denverd1 is offline
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Re: 0331 TUPY head stamp through oil cap?

Quote:
Originally Posted by lazyxj View Post
Cherokees never were equipped with a TUPY head, they were not manufactured until 2002 or 2003 and are found on TJ and WJ 4.0 engines .

Pics here.

https://www.jeepforum.com/forum/f22/...ml#post9187589
This. If your head is original, not a TUPY

Sent from my SAMSUNG-SM-G930A using Tapatalk
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Old April 1st, 2019, 19:49
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jbeintherockies jbeintherockies is offline
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Re: 0331 TUPY head stamp through oil cap?

If you have a TUPY head, then yes, you can see the "TUPY" stamp if you remove the oil filler cap from the valve cover.

I can post a photo upon request.
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Old April 2nd, 2019, 16:41
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jimbar jimbar is offline
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Re: 0331 TUPY head stamp through oil cap?

https://www.cylinder-heads.com/produ...head-complete/
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