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LJ XU1 Numbers Please

Started by _sunburst73-xu1_ , Jul 11 2011 06:00 PM

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#1 _sunburst73-xu1_

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Posted 11 July 2011 - 06:00 PM

Would like to ask any forum member that has a LJ XU1 head,weather its a 72 or 73 if they could tell me what the number is that is at the back of the head next the the H.
This is what I mean
Attached File  100_2250.jpg   45.64K   9 downloads

Any input would be appreciated.

Edited by sunburst73-xu1, 11 July 2011 - 06:01 PM.

#2 _sunburst73-xu1_

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Posted 11 July 2011 - 07:05 PM

Sorry should have mensioned that the Cast date of the head would be needed aswell.
cheers Dane

#3 _Ozzie Picker_

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Posted 11 July 2011 - 07:45 PM

hi dane,

mine 27F3 H9,or 9H carn,t remember which way around.

can check if you need to be sure.

#4 S pack

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Posted 11 July 2011 - 10:28 PM

G/day Dane

I've got H252 12H

Cheers
Dave.

#5 _oz772_

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Posted 11 July 2011 - 11:33 PM

I recently sold an H252 head that was 11H.

#6 frash da bucket

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Posted 12 July 2011 - 01:52 AM

Hi Dane,

Mine is L32 11H.

Cheers John.

#7 _sunburst73-xu1_

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Posted 12 July 2011 - 09:47 AM

Thank you anyone else????

#8 Bazza

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Posted 12 July 2011 - 10:25 AM

Hi all

Mine is a H 25 2 12 H also

Cheers

Bazza

#9 _sunburst73-xu1_

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Posted 12 July 2011 - 02:18 PM

Thanks Bazza,has anyone got anymore in 73 casting.C223,20f3,27f3????

#10 _vin150cars_

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Posted 12 July 2011 - 04:26 PM

mine is 27f3 10H

#11 ewe-one

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Posted 12 July 2011 - 07:10 PM

H = High Compression, 9 cast version maybe? I have a E172 head and 7 H

Edited by ewe-one, 12 July 2011 - 07:13 PM.

#12 _scooter_

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Posted 12 July 2011 - 07:37 PM

H = High Compression, 9 cast version maybe? I have a E172 head and 7 H

My spare on (which is for sale) is 27F3 10H

#13 _sunburst73-xu1_

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Posted 12 July 2011 - 08:18 PM

H = High Compression, 9 cast version maybe? I have a E172 head and 7 H

Thanks All for giving some input.
H defiantly stands for High compression but whats the numbers mean?????
Was told about a bit of a theory with them numbers but its not working out. :Headbang2:
Dose anyone know or wants to guess,because thats all I'm doing. :dontknow:

#14 S pack

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Posted 12 July 2011 - 08:46 PM


H = High Compression, 9 cast version maybe? I have a E172 head and 7 H

Thanks All for giving some input.
H defiantly stands for High compression but whats the numbers mean?????
Was told about a bit of a theory with them numbers but its not working out. :Headbang2:
Dose anyone know or wants to guess,because thats all I'm doing. :dontknow:


Hi Dane

I reckon the number next to the H is a pattern identification number.

Each pattern for making the sand casting mould would have a different number for quality control.

That's my theory anyway.

Cheers
Dave.

#15 _sunburst73-xu1_

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Posted 13 July 2011 - 06:08 PM



H = High Compression, 9 cast version maybe? I have a E172 head and 7 H

Thanks All for giving some input.
H defiantly stands for High compression but whats the numbers mean?????
Was told about a bit of a theory with them numbers but its not working out. :Headbang2:
Dose anyone know or wants to guess,because thats all I'm doing. :dontknow:


Hi Dane

I reckon the number next to the H is a pattern identification number.

Each pattern for making the sand casting mould would have a different number for quality control.

That's my theory anyway.

Cheers
Dave.

Thanks Dave
The theory I'm trying to confirm is that number is suppose to be the month that the head was made and the cast date that we refer to is a cast date molding to identify the heads???? :dontknow:
But when you put the heads to the cars and motors there are alot that haven't work out.My car is a prime example,it was completed on the 4/7/73 and the head is a C233 and has a 9 on it which would mean its a 9th month.Unless my car had a head replacement at some time after the 9th month 73,who knows.Were these cars/head renowned for stuffing up to the point of being replaced back in the day?????
Would love to find out and look at some untouched original cars to see what they have.Aldo would be the man to ask but I haven't seen him on here much lately.
cheers Dane

Edited by sunburst73-xu1, 13 July 2011 - 06:11 PM.

#16 _Ozzie Picker_

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Posted 13 July 2011 - 06:55 PM

from my hands on over the years,

the heads never stuffed up on peoples cars that i know of,it would have to be a big blow up like block destroyed aswell.

#17 Shtstr

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Posted 13 July 2011 - 07:21 PM

From my understanding the number beside the h stands for the series of the head as they where constantly revised to improvements when making. so each series with a higher number was more improved.

#18 _sunburst73-xu1_

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Posted 13 July 2011 - 07:34 PM

OK has anyone seen any numbers that are lower then the follow,

E172 heads has been seen to have a 5,6,7 and 8,nothing lower then 5 E=5

H252 has been seen to have a 9,10,11,12 nothing lower then 9 H=8

C233 only have seen mine which is a 9 C=3

20F3 has been seen to have a 9 and 10 F=6


27F3 has been seen to have a 9,10,11,and 12.
Again this is only what I know of.

#19 S pack

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Posted 13 July 2011 - 08:53 PM

OK has anyone seen any numbers that are lower then the follow,

E172 heads has been seen to have a 5,6,7 and 8,nothing lower then 5 E=5

H252 has been seen to have a 9,10,11,12 nothing lower then 9 H=8

C233 only have seen mine which is a 9 C=3

20F3 has been seen to have a 9 and 10 F=6


27F3 has been seen to have a 9,10,11,and 12.
Again this is only what I know of.


Hi Dane

Can't agree with the theory you are following. I think a fair bit has been said in the past about cast dates and how to read them.

Your cast date examples as follows:
E172 = May 17, 1972.

H252 = August 25, 1972.

C233 = March 23, 1973.

20F3 = 20 June, 1973.

27F3 = 27 June, 1973.

GMH predominantly used letters to represent the month. With the exclusion of the letter I, which could be misinterpreted as a 1.
I can't see any reason why they would put two cast dates in different formats on the same part.

At this point in time I cannot think of any other reason for the number next to the H (for high compression) except it being to identify the particular head pattern that a head has been cast from.

I would expect GMH would have had more than one pattern for producing the sand castings to make the cylinder heads.
Looking at other Holden parts over the years, especially cast alloy parts, it is common to see identical parts but with different numbers (single or double digit) cast in them.

I believe these are tooling numbers, so multiple tools to make an identical part have individual identification numbers. That way if a part is found to be failing prematurely they can track down if a particular tooling might be the cause or if the failed parts are coming from a mix of different tools.

Cheers
Dave

#20 _sunburst73-xu1_

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Posted 13 July 2011 - 08:59 PM

Yeah that makes sense,but surely Holden would have made a particular cast dated head at a later date then the date on the head wouldn't they???I suppose at the end of the day its just a number. :dontknow:

Edited by sunburst73-xu1, 13 July 2011 - 09:03 PM.

#21 S pack

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Posted 14 July 2011 - 08:41 AM

G/day Dane

Quote: "My car is a prime example,it was completed on the 4/7/73 and the head is a C233".

Your cylinder head does seem to be made a few months early for your car.

How does the cast date of your block align with the head cast date?

Maybe the head had been replaced, for whatever reason.

#22 _sunburst73-xu1_

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Posted 14 July 2011 - 08:59 AM

Hi Dave my block is coded 15F3
I know of 3 other early 7th month completed xu1s that have the C233 heads on them.And I know that mine could/should??? have a 20F3 head.But again how knows. :dontknow:
Again at the end of the day you can't say the head that I have is not consistant with my car.

#23 Kockum

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Posted 14 July 2011 - 03:42 PM

This is what I was told years ago .[It may be a pile of crap .]

All the 20F3 heads were sent straight from the foundry to Dave Bennett for special machining and final completion .

They were flat out getting these heads done in the time frame that Holden specified

Holden wanted to send more heads to be done - I can only assume these were the 27F3 ones .

Bennett said they could not take anymore heads and finish them on time , so Holden was forced to do the special machining and final completion themselves .

I have opened a can of worms so go easy on me MIKE 73 [LOL]

#24 GTR-1

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Posted 16 July 2011 - 08:33 AM

Thanks Bazza,has anyone got anymore in 73 casting.C223,20f3,27f3????



I'll add one: 20F3 9H

#25 _sunburst73-xu1_

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Posted 16 July 2011 - 09:21 AM

This is what I was told years ago .[It may be a pile of crap .]

All the 20F3 heads were sent straight from the foundry to Dave Bennett for special machining and final completion .

They were flat out getting these heads done in the time frame that Holden specified

Holden wanted to send more heads to be done - I can only assume these were the 27F3 ones .

Bennett said they could not take anymore heads and finish them on time , so Holden was forced to do the special machining and final completion themselves .

I have opened a can of worms so go easy on me MIKE 73 [LOL]

Hi Kockum
Thats very interesting,maybe you have opened a can of worms.Time will tell.



Thanks Bazza,has anyone got anymore in 73 casting.C223,20f3,27f3????



I'll add one: 20F3 9H

Thanks
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