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LJ Cylinder Head Number

Started by lxsstorana , Feb 14 2007 02:10 PM

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30 replies to this topic

#1 lxsstorana

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Posted 14 February 2007 - 02:10 PM

Hi Guys,

Just wondering if someone can check a cylinder head number for me.

The number is - 2811930 Holden 6 E 3 12 L

Thanks Mick.

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#2 _smiley_

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Posted 14 February 2007 - 02:42 PM

GTR head dated 6/5/73

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#3 lxsstorana

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Posted 14 February 2007 - 02:57 PM

Thanks Smiley, :spoton:

I have an LJ GTR which is complianced 7/73 so that matches the car. I believed it was the original head but just wanted to check it.

Thanks Mick.

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#4 warrenm

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Posted 15 February 2007 - 07:34 AM

Does this head have a small or large combustion chamber?

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#5 lxsstorana

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Posted 15 February 2007 - 11:24 AM

I don't know but I can take a photo of it if you like. I bought my GTR with a slightly worked 202, QL prefix engine in it. I also got the original engine with it as well. Judging by how hard the head bolts were, I'm guessing the head has not been off the car before. Mick.

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#6 _gtr-xu1_

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Posted 15 February 2007 - 12:00 PM

doesnt the L mean its a low compression engine, large chamber head,
and the XU1s have H high compression small chamber head
correct me if im wrong

cheers
GTR-XU1

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#7 lxsstorana

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Posted 15 February 2007 - 06:41 PM

Yeah, I thought the same but I'm still learning these codes which is why I posted my numbers in the first place to get some advice.

Mick.

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#8 _ck1971_

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Posted 15 February 2007 - 08:52 PM

doesnt the L mean its a low compression engine, large chamber head,
and the XU1s have H high compression small chamber head
correct me if im wrong

cheers
GTR-XU1

QL means that it is out of an HQ, J, X or Z and it's your run of the mill 202. XU-1s are 3100X, CK or JP.

CK.

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#9 _gtr-xu1_

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Posted 15 February 2007 - 09:35 PM

doesnt the L mean its a low compression engine, large chamber head,
and the XU1s have H high compression small chamber head
correct me if im wrong

cheers
GTR-XU1
QL means that it is out of an HQ, J, X or Z and it's your run of the mill 202. XU-1s are 3100X, CK or JP.

CK.

were talking about heads NOT blocks L and H cast in heads not the engine prefix.

however maybe the blocks are

JL = J for series LJ and L for low comp
QL = Q for series HQ and L for low comp

JP= lj series and P = performance upgrade XU1 engine
this could be just a good calculated guess on the numbering

what do you recon?

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#10 _oz772_

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Posted 15 February 2007 - 11:12 PM

K = 186
L = 202
P = 202 (XU1)
Can't remember 173 - is it D?
I think that is what the letter designation means.

Edited by oz772, 15 February 2007 - 11:13 PM.

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#11 _ck1971_

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Posted 16 February 2007 - 01:59 AM

K = 186
L = 202
P = 202 (XU1)
Can't remember 173 - is it D?
I think that is what the letter designation means.

That's right, the letters don't have any meaning apart from identifying the type of engine, L has nothing to do with low compression it's just the letter GMH chose to use.

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#12 _gtr-xu1_

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Posted 16 February 2007 - 07:40 AM

thanks for you input on the engine prefix now can you start at the top of the thread reread and you will see it started about the L and H cast into the head
and we havnt got a answer yet.

cheers
GTR-XU1

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#13 _gtrtorana_

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Posted 19 February 2007 - 09:08 PM

The number is - 2811930 Holden 6

I have this head on my engine at the moment. The only thing is that my head is a 186 head, Not an LJ 202 head. It also has E 7 1

Does this head have a small or large combustion chamber

It has the large chamber and has the L for low comp cast into the side of the head. I got from YT as a change over many years ago.

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#14 _gm3300_

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Posted 26 February 2007 - 09:39 PM

It's assumed that heads with an "L" cast into them are Low-Compression, this is not correct, it's the application of the type of head to a specific engine capacity that determines the compression ratio.

For example, the 2811930(casting number)/2819457(spare part number) head is used for a number of different engines giving the result of:

2250 eng 7.8:1 comp ratio (low)
2850 eng 8.3:1 comp ratio (low) + dished pistons
3300 eng 9.4:1 comp ratio (high)

The 2811929(casting number)/2819454(spare part number) head is the "H" cast head used on LJ's to produce a high compression version of the 2250 and 2850 engines.

The 202 used dished pistons with the 2811930/2819457 head to make a 7.8:1 low-compression version, originally only in HQ's as a "QM" engine, later in LJ's as a "JM" engine.
grant

Edited by gm3300, 26 February 2007 - 09:40 PM.

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#15 _gtrtorana_

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Posted 27 February 2007 - 08:15 PM

Well you learn something everyday. It will take a long time, if ever, for the true meaning of the L and the H cast into the head to be fully understood by the majority of people out there. I was told as a young boy that L meant low comp and H meant high comp.

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#16 _UFO XU1_

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Posted 28 February 2007 - 09:04 PM

i have always assumed that the L was the larger combustion chamber thus low compression H was the smaller combustion chamber thus higher compression.i think this is correct.

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#17 _LoneOranger_

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Posted 28 February 2007 - 10:15 PM

Sorry to thread steal,
I'm looking for one of these heads at the moment
K or L 73

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#18 _I973lj_

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Posted 11 November 2016 - 04:45 PM

Ive read this about 10 times now .ime confused still.so a 2811930 head is only on gtr or is it on more 202 s

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#19 S pack

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Posted 11 November 2016 - 05:24 PM

Ive read this about 10 times now .ime confused still.so a 2811930 head is only on gtr or is it on more 202 s

2811930 is applicable to all high compression GL, JL, QL and HL 202 engines prior to ADR 27A.

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#20 yel327

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Posted 11 November 2016 - 06:02 PM

Plus 11QL, 11QM, QM, GM, JM, QE, GE, HE, JE, FE plus others I can't think of at the moment.

Plus 11QL, 11QM, QM, GM, JM, QE, GE, HE, JE, FE plus others I can't think of at the moment.

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#21 EunUCh

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Posted 11 November 2016 - 06:05 PM

Was it only 202 or did some other heads get the 2811930 # as well ? :dontknow:

H861.JPG 223.15K 5 downloads

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#22 S pack

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Posted 11 November 2016 - 06:26 PM

Was it only 202 or did some other heads get the 2811930 # as well ?

H861.JPG

There has been talk of some of those very early 2811930 heads having adjustable rockers. Good to finally see one. Cast date appears to be 26? Feb 1971.

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#23 grumpy xu1

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Posted 11 November 2016 - 07:54 PM

Hi Dave, didn't lj gtr as in jl prefix also use 2811929 cylinder head ? Im sure that you have said that before ? But i could be mistaken. Gary.

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#24 yel327

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Posted 11 November 2016 - 08:11 PM

2811929 is the 173 HC head. Basically a fixed rocker version of the 161H head. On a 202 it is an XU1 setup (minus bigger valves, porting and rocker studs).

Edited by yel327, 11 November 2016 - 08:14 PM.

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#25 grumpy xu1

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Posted 11 November 2016 - 08:18 PM

So the 2811930 is the 202 gtr, couldn't remember. I have a parts book somewhere. I did some cleaning a while ago & can't remember where ive put anything since. So appologies for any questions that i should know the answer too. thanks, Byron ! Gary.