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Block and head identification

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Block and head identification
Youngseven Offline
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Joined: Mar 2020 Posts: 16 Threads: 10
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Location: Guildford
#1
22-05-2020, 05:33 PM
Hi all, I have two blocks and two heads which I need some help in identifying their age and what model they may have been off.

Block one - 25516 (has a screw in core plug)

Block two - 105340, 1a504 af4, m228094

Head one - 1a38 u3 af1

Head two - 1a56 k6 af3, 60171


Thankyou in advance,
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Reckless Rat Offline
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Joined: Aug 2017 Posts: 2,415 Threads: 33
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Location: Deepest Frogland 30960
Car type: 1933 RP Standard Saloon
#2
22-05-2020, 07:03 PM
The correct number to quote on your engine blocks is the one stamped in the valve chest cover. The second one quoted as M228904 is a crankcase number from 1935. Blocks with screw-in core plugs date from 1930 and earlier.
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JonE Offline
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#3
22-05-2020, 07:05 PM (This post was last modified: 22-05-2020, 08:04 PM by JonE.)
https://sevenrk.wordpress.com/2019/05/31...ion-heads/ gives good summary of the LC heads...

Annoyingly, I dont recognise the second head though. Does it have a date stamp? as we may need to add it!
https://ulster7.wordpress.com https://sevenrk.wordpress.com/
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Ian McGowan Offline
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Location: Shropshire, UK
#4
22-05-2020, 07:11 PM
block 25516 I would estimate as some time 1926
block M 228094 I would estimate as mid 1935
Head 1A38 Well, I have a 1A38 AF2 head with priming ports blanked off with brass plugs which I believe to be the original low compression head on my 1929 engine.
Head 1A56 outside of my experience but no-doubt someone else will know.
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Mike Costigan Offline
former 'Grey Mag' editor
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Location: Sherwood Forest
Car type: 1938 Talbot Ten Airline
#5
22-05-2020, 08:52 PM
The AF numbers refer to the appropriate Austin Foundry, and were there for quality control purposes; they have no relevance to identification of the individual part.
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