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Liquefaction Offline
#1 Posted : Sunday, 28 July 2019 6:57:04 PM(UTC)
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A few questions for the red engine gurus out there

I tore down the 186S today and the crank is a 7431320, I’m pretty sure it’s a steel one

The block has G1330 , is that August 1970?

The head is 7437395 h6 0 and with an L at the rear of the head

Is this the correct head, being a low compression head is seems wrong but I’m thinking this is a 161 head

I have a 161 high compression head in the shed I can use, and an 186a engine there I could take the head off

What is the correct head for a 186S for an hk ?

The pistons have a number 2 stamped in to them, I guess that means 20 thou over

Cheers
HK1837 Offline
#2 Posted : Sunday, 28 July 2019 7:11:32 PM(UTC)
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Al 186S are forged crankshaft originally. The parting line will tell you if cast or forged.

G is July but something wrong with the rest of that cast date.

All 179, 186 and 202 other than XU1 have L heads. H and L are only relevant to the 173 and down engines.

I think 186S head is identical to 186 and 161L head, just the valves and springs slightly different.

2 not sure. 20 thou over normally would be 020 on them.
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Liquefaction on 28/07/2019(UTC)
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#3 Posted : Sunday, 28 July 2019 8:33:03 PM(UTC)
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Originally Posted by: HK1837 Go to Quoted Post
Al 186S are forged crankshaft originally. The parting line will tell you if cast or forged.

G is July but something wrong with the rest of that cast date.

All 179, 186 and 202 other than XU1 have L heads. H and L are only relevant to the 173 and down engines.

I think 186S head is identical to 186 and 161L head, just the valves and springs slightly different.

2 not sure. 20 thou over normally would be 020 on them.

Thanks Byron
Once again you are a big help

The cast date has “Holden” above it and it’s definitely G 1 30

One further question if I may

How many different heads did the 186 come with from hr to hg?
HK1837 Offline
#4 Posted : Sunday, 28 July 2019 8:44:53 PM(UTC)
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G130 is good. That is July 13 1970. G1330 isn’t.

Not sure on casting numbers but I think there is only 2 186 heads design wise, normal and A/C. 186S had I think different exhaust valves and maybe springs but the casting should be the same. Confirm first though, I’m going solely from memory.
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HK1837 Offline
#5 Posted : Monday, 29 July 2019 6:37:54 AM(UTC)
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I just checked Ben and Warren's book and 7437395 is right for HK-HG 186 or 186S without A/C and it will also be right for 161L. Given the cast dates of the engine block of July 13 1970 and the head on August 6th 1970 they will most likely have been originally together on a HG 6cyl model, probably a GTS but could also be from most other 6cyl HG models.
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BENNETT Offline
#6 Posted : Wednesday, 31 July 2019 11:08:42 PM(UTC)
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Decent, need to accomplish something like this with mine.
Liquefaction Offline
#7 Posted : Tuesday, 6 August 2019 12:51:11 PM(UTC)
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The block has 6 big x’s welded into the inside of the block
Also the springs are thicker than normal 186 springs
And the spring retainer caps all have x on them

These are the differences from a standard 186 I’ve seen so far

The head was a bit to slogged out so I’m putting a 161hc head on it
It will receive a stage 3 cam and the ww2 will get 253 jets
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#8 Posted : Tuesday, 6 August 2019 4:13:30 PM(UTC)
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It will be pretty high in compression with a 161H head on it. Will be around 10:1 static with flat top 186 pistons so may not like most fuel, unless you get the right cam for it.
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Liquefaction Offline
#9 Posted : Tuesday, 6 August 2019 8:35:10 PM(UTC)
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Originally Posted by: HK1837 Go to Quoted Post
It will be pretty high in compression with a 161H head on it. Will be around 10:1 static with flat top 186 pistons so may not like most fuel, unless you get the right cam for it.


It will be run on 100 octane pump gas

Is the cross webbing on the block a feature of the s engine?

HK1837 Offline
#10 Posted : Tuesday, 6 August 2019 9:35:31 PM(UTC)
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As far as I know there is no difference between 186L, 186P or 186S blocks. Basically when they were cast they were identical bar whatever minor variations there were between different pattern components used to form up each sand mould.
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castellan Offline
#11 Posted : Thursday, 8 August 2019 11:17:56 AM(UTC)
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Originally Posted by: Liquefaction Go to Quoted Post
The block has 6 big x’s welded into the inside of the block
Also the springs are thicker than normal 186 springs
And the spring retainer caps all have x on them

These are the differences from a standard 186 I’ve seen so far

The head was a bit to slogged out so I’m putting a 161hc head on it
It will receive a stage 3 cam and the ww2 will get 253 jets


They are not welded X they are cast as to the sand casting as a inspector does them markings as he is pointing something out with the sand casting starting to get out of wack, some have O cast in the same place. any block regardless can have such markings.
HK1837 Offline
#12 Posted : Thursday, 8 August 2019 11:25:41 AM(UTC)
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Some have B too as in “B cast” heads. I guess X was an easy thing to scratch into the green sand.
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castellan Offline
#13 Posted : Thursday, 8 August 2019 4:37:15 PM(UTC)
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Originally Posted by: HK1837 Go to Quoted Post
Some have B too as in “B cast” heads. I guess X was an easy thing to scratch into the green sand.


No the B cast heads is on the outside for that reason to ID the heads.

I think that we do have what he is talking about with pictures like so on this forum somewhere.
HK1837 Offline
#14 Posted : Thursday, 8 August 2019 4:59:18 PM(UTC)
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Yes it is on the outside but it is there for a purpose. Like the X on early pollution V8 heads or across the 308 on L34 blocks. It was scratched into the green sand for whatever reason.
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