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Head Set Up

Started by _samjaymz1_ , Mar 23 2009 11:52 AM

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25 replies to this topic

#1 _samjaymz1_

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Posted 23 March 2009 - 11:52 AM

G'Day guys
im currently in the process of rebulding by engine in my Lj and have had a few bits of conflicting advice when it comes to putting my new yella terra head on. it is a 161 head #2811929 i believe and i was under the impression this would need a different set of push rods to adapt to my 202 engine. also will the rockers of my 202 head be suitable or will i have to get 161 rockers for this head as well. any light you could shed on the situation would be very much appreciated.

sam

Sams_Head_05.jpg 613.3K 34 downloads

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#2 rodomo

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Posted 23 March 2009 - 07:42 PM

You'll need early rockers 149,161,179,or 186 and pushrods.
Your 202 stuff wont bolt on to that head.

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#3 _egk4d_

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Posted 23 March 2009 - 10:03 PM

your pic looks like its a 173/202 style head as its got bolt on rockers and round pushrod holes.
161/186 style have studs and oval pushrod holes

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#4 rodomo

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Posted 23 March 2009 - 10:27 PM

Good point.
After blowing up the picture I would agree. I read 161 head?
Maybe someone could identify the head from the number? 173? 202?
If that is the case, your 202 stuff will fit.

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#5 _HQ SS_

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Posted 24 March 2009 - 12:01 AM

It is a 173/202 style head and I will stand corrected but I would say its a 173 head.
Sam I would be very interested to find out the date code on that head.
If you have a look here
http://gallery.oldho...yl Casting ids/
picture 05 is the same casting number as yours.
Does your head have the same chamber design as the one in the picture.
Picture 06 is a 2811930 cast numbered head which I believe is a 202 head and it has a larger chamber
than the 2811929 head.
I have been told else where that 173 and 202 engines have there High and Low compressions changed by the pistons in the block.
But the 2811929 says it is a H high comp head on it and it does look to be high comp as compared to the 2811930 cast numbered head.
Any feed back on this would be appreciated.
Cheers Paul.

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#6 _samjaymz1_

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Posted 24 March 2009 - 08:59 PM

ok guys here all all the pictures of the head. previously i was informed by a user on these forums it was a 161??? have i been led down the garden path?

Sams_Head_01.jpg 627.72K 19 downloads

Sams_Head_02.jpg 604.62K 26 downloads

Sams_Head_03.jpg 634.37K 23 downloads

Sams_Head_04.jpg 534.79K 13 downloads

Sams_Head_05.jpg 613.3K 9 downloads

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#7 rodomo

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Posted 24 March 2009 - 09:44 PM

Have a look at this thread:
http://www.gmh-toran...showtopic=35157
Does your head have stampings on the back of the head like these?
You might have to scrape/sand some paint off to see them.

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#8 _Drag lc_

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Posted 24 March 2009 - 09:46 PM

i dont know mate but i wasnt going to say it but that paint job has left alittle to be desired.

Hayden

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#9 _samjaymz1_

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Posted 24 March 2009 - 09:50 PM

it has the numbers 1 8 2 on the back in that spot by the looks of things.. very hard to read though

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#10 _samjaymz1_

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Posted 24 March 2009 - 09:56 PM

yeah hayden paint is not great thats for sure, but its gettin all sand blasted and resprayed red anyways so no big one as far as im concerned.

cheers sam

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#11 _HQ SS_

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Posted 25 March 2009 - 12:06 AM

Going by your last picture it has bolt on rocker gear not studs so its a 173 or 202 head. (I still think 173 because of the smaller chamber)
The 2811929 head I have is a 24E4 head so 24th 5th 74 so way after the beginning of the use of the 173 and 202 engines
It has been shaved heaps by the looks of the thumb print.
I see it has a slightly different chamber design now but I think that it has ground that way to un shroud the larger valves and the amount it has been decked as changed it some what as well.
It has duel springs and the inlets have had the divider mod done to them but it does not have the Y/T on the valves.
It seems to have the number the guys are talking about on the other thraed so is it a actual Y/T or not.
Cheers Paul.

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#12 _Drag lc_

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Posted 25 March 2009 - 07:18 AM

Sam,
sweet :spoton:

and it also has the stampings on rear of head around the same date? as the ones i have here.

Thanks Hayden

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#13 _samjaymz1_

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Posted 25 March 2009 - 10:50 AM

ok so whats the general concenus on the head? is the fact that is has been shaved going to be a problem running wise...beginning to get that sick feelin i been ripped off.

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#14 FastEHHolden

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Posted 25 March 2009 - 11:08 AM

You could CC the chamber...find out how big they are....use a 10 ml syringe..cost stuff all from a chemist, flip the head and see how much water it takes to fill it. From there you can work out the compression ratio.

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#15 yel327

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Posted 25 March 2009 - 11:38 AM

Only 173 high comp engine uses this head. 173 low comp uses a 202 head. The H and L on the heads is only relevant to the engines that use different heads for high and low comp engines (149, 161, 173). 179, 186, 202 (and i think 138) use different pistons to achieve the low comp engine hence all have the L cast head, XU-1 excluded of course.

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#16 makka

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Posted 25 March 2009 - 11:44 AM

I wouldnt say you have been ripped, it is basically a newer 161 head

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#17 _samjaymz1_

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Posted 25 March 2009 - 12:18 PM

it does have the letter H stamped on the head as well as J 9. so if its a 173 hi comp head then what is needed to adapt to my 202 red motor? will it need shorter push rods, different rockers? or will my 202 stuff off my old 202 Low comp head be ok

Edited by samjaymz1, 25 March 2009 - 12:31 PM.

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#18 rodomo

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Posted 25 March 2009 - 03:28 PM

flip the head and see how much water it takes to fill it.

Interesting you mentioned this.

I am going to take a 2850 head to be crack tested tonight and was going to ask my engine builder buddy what to use to "CC" the head and piston dish on the Bombadoor engine. (Needs more comp. with new cam we think)

I think water has too much surface tension to get a true reading?

I'll report back later.

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#19 FastEHHolden

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Posted 25 March 2009 - 03:48 PM

you can either place a pane of glass/perspex over the combustion chamber and fill it thru a small uncovered part...or just sit a ruler on the head and stop when the meniscus touches the ruler.

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#20 rodomo

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Posted 25 March 2009 - 04:02 PM

Meniscus?

You made that up......................... didn't you? :huh:

You mean the skin on top of the water? :huh:

I never thought of the perpex bit.

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#21 FastEHHolden

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Posted 25 March 2009 - 04:10 PM

Google can be your friend too!!

Nah...I cc'ed a head in science at school...and we both know my memory doesn't have to stretch back as far as yours does to remember big words from school

Now all we need is some pointy head "Wayne Kerr" to get on and point out I have incorrectly used the term meniscus. :tease:

Edited by FastEHHolden, 25 March 2009 - 04:12 PM.

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#22 _samjaymz1_

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Posted 25 March 2009 - 06:57 PM

meniscus....mate you have used the perfect term there and in the right context. i finished school in 07 and i think i have forgotten atleast 90% of everythin i learnt and yet you have drropped a stunner there.
this should be Fast EH's forum of english and scientific terminology not torana forums haha

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#23 wot179

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Posted 25 March 2009 - 07:04 PM

A Kiwi mate once told me "wimmin is better cooks than meniscus". Sorry about that.

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#24 _HQ SS_

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Posted 25 March 2009 - 09:11 PM

it does have the letter H stamped on the head as well as J 9. so if its a 173 hi comp head then what is needed to adapt to my 202 red motor? will it need shorter push rods, different rockers? or will my 202 stuff off my old 202 Low comp head be ok

Your 202 rockers and push rods will bolt straight on to this head.
As I posted before duel springs and the port work and blending on the chambers look like it has been done well
so not a back yard type job by the looks of it.
The numbers on the back 1 82 seems to match up along the lines of what is being discussed on the other thread so
this head could still be a Y/T head, it just may have had none Y/T valves fitted on a rebuild it has had.

The J9 code on it should have another number with it.
J9 could mean 9th of the September 197x or x September 1979

If it is a real high comp head you may have to get your dissy re graphed to suit it.
Cheers Paul.