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Block and head identification
#1
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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#2
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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#3
[Only registered and activated users can see the links Click here to register] 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!
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#4
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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#5
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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