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173 head numbers - 9 port
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David HR Offline
#1 Posted : Wednesday, 2 June 2021 5:30:34 PM(UTC)
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what are the id numbers for for all 173 heads
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Dr Terry Offline
#2 Posted : Friday, 4 June 2021 10:51:47 AM(UTC)
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The only head numbers I have for 173 engines are 2811929 for HG/HQ/HJ/LJ/LH/LX (pre-ADR27A) & 2815843 for the ADR27A Red Motors. Lo-Comp motors just use the equivalent 202 head.

I'm not sure about the 173 Blue Motor head, the only number I have is 92013755, but it is unconfirmed.

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HK1837 Online
#3 Posted : Friday, 4 June 2021 12:07:14 PM(UTC)
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There should be two 173 blue heads, early and the later one with the air pump. Unless the early one had the bosses there undrilled?
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Dr Terry Offline
#4 Posted : Friday, 4 June 2021 12:22:55 PM(UTC)
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Originally Posted by: HK1837 Go to Quoted Post
There should be two 173 blue heads, early and the later one with the air pump. Unless the early one had the bosses there undrilled?


There's probably more than that, due to the different A/C compressor mounts in that era. Also from memory there were 2 different locations for the temperature sender. Again they could be the same casting, but differently machined.

Dr Terry
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kevrev Offline
#5 Posted : Friday, 4 June 2021 5:15:51 PM(UTC)
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The 1973 LC parts catalogue list 2811930 for low comp 2850 engine (same as 202) and 2823850 for high comp
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HK1837 Online
#6 Posted : Friday, 4 June 2021 5:37:29 PM(UTC)
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Parts catalogues list part numbers, not casting numbers. They are rarely the same thing. However my LC parts catalogue lists the correct casting numbers as part numbers for the bare heads for 2850 and CB/CC prefix 2250, ie 2811929 and 2811930. However the part numbers listed for the 2250L/2250H and 2600L/2600H are different to the casting numbers, ie 7438300 and 7438299.
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David HR Offline
#7 Posted : Saturday, 5 June 2021 12:11:37 PM(UTC)
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What is 7438300 and what is 7438299 are they 173 or 202 heads?
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HK1837 Online
#8 Posted : Saturday, 5 June 2021 2:03:20 PM(UTC)
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They are part numbers for 138/161/186 heads.
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David HR Offline
#9 Posted : Saturday, 5 June 2021 2:29:19 PM(UTC)
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What is this ID number for 2823850
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kevrev Offline
#10 Posted : Saturday, 5 June 2021 5:21:30 PM(UTC)
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I thought I gave that part number 4 posts up, 2850(173) high compression
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Dr Terry Offline
#11 Posted : Sunday, 6 June 2021 10:06:48 AM(UTC)
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Originally Posted by: David HR Go to Quoted Post
What is this ID number for 2823850


I don't have that one listed as a head casting number. It does appear as a part no. though.

Dr Terry
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David HR Offline
#12 Posted : Sunday, 6 June 2021 11:41:09 AM(UTC)
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Cheers for that Dr Terry

What is the biggest over bore size advisable for a 186?
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Dr Terry Offline
#13 Posted : Sunday, 6 June 2021 6:38:35 PM(UTC)
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Originally Posted by: David HR Go to Quoted Post
Cheers for that Dr Terry

What is the biggest over bore size advisable for a 186?


In my experience 0.040" was the most common "safe" overbore, this resulted in 190 ci.

0.060" was also common (192 ci)

0.080" was less common (194 ci,) but needed a good block.

Dr Terry
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David HR Offline
#14 Posted : Sunday, 6 June 2021 8:58:14 PM(UTC)
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Cheers for that, i have a block 40 thou over.
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Smitty2 Offline
#15 Posted : Sunday, 6 June 2021 9:51:48 PM(UTC)
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Originally Posted by: HK1837 Go to Quoted Post
There should be two 173 blue heads, early and the later one with the air pump. Unless the early one had the bosses there undrilled?



cannot comment on the airpump.. but there are two as far as i know.

one with a boss for the temp sender unit at the front and another with the sender unit at the back of the head

the one with the sender at front should say 9947487 between the rocker mount bosses and the other?
.. I have 2 numbers and cannot ascertain which is correct, this also clouded by 173/2850 engines being
fitted to VK (for special govt and export orders)




Club circuit racing...the best fun you can have with your pants on
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