Cooper S engine production date

General Chat with an emphasis on BMC Minis & Other iconic cars of the 1960's. Includes information on MK1 Action days.
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Cooper S engine production date

Post by DonRacine »

Currently rebuilding an early Cooper S engine and hope that someone can help me figure out the approximate production date. The tag on the engine reads 9F/SA/Y/38907 .
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Re: Cooper S engine production date

Post by iain1967s »

Hi Don. Welcome to the forum.

That engine would be mid October 1965 I think.

Here are some others in a similar range:
[38678 built on 6 oct] ... 163616.jpg
[39769 built on 26 nov] ... G_7060.jpg
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Re: Cooper S engine production date

Post by TECH396 »

Pretty sure the date code is cast into the block showing Shift/day?/Month/year.
I'd be interested to know what yours says as it's something I'm researching. I've asked around, but no- one seems to reply.
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Last edited by TECH396 on Sat Feb 20, 2021 5:50 am, edited 3 times in total.
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Re: Cooper S engine production date

Post by janerick3 »

Engine likely came from the production lot of Cooper S's with chassis numbers ending with 799XXX (like mine). My original, long-departed engine was 38810 (14 October)--now has an early, thick-flange 12H/397F block w/many of the original accessories installed.

For what it's worth, 767XXX was the previous block of Cooper S car numbers and 820XXX was the succeeding block...
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Re: Cooper S engine production date

Post by Terrapin-52 »


I have a block hear (no engine No', it has been bored) and has D21J6 cast on the back of the block, any Idear of build date and engine size/car

sorry to but in

regards mike
1982 mini City
Terrapin chassis No'52, with A series engine/box
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