Ok I've striped down a 1100S engine and want to check what main parts I have.
Gear box: 22G1832
(As far as I know it has a 3.444:1 diff, rod change, pot joints and I'm pretty sure it's 4 syncro).
Block: 12YD/Ta/H####
(Rough year and any other interesting info please)
Crank: 12G1505A
(Large, small journal?)
Head: 12G940
Is it a good head to start with?

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Respect mine and I'll respect yours.

12G1505 is a large journal crank, so large journal rods too.

Depends on what you want to do

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Lillee - 1969 Morris Mini K

Double post

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Lillee - 1969 Morris Mini K

After googling a bit the block #12YD/Ta/H says its a 12YD/Ta/H 1275 Leyland 1275LS (12" Wheels).

Is that the sort of info your after ?

Info was from here http://www.miniownersclub.com.au/index. ... 6&Itemid=2

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12YD/Ta/H was only used in the Morris 1100S.
It was not used in the 1275LS.

They changed from the small journal to large journal crank at engine 12YD/Ta/H10488.

Engine is an 1100s manual
Crank is the std large journal one.
Worth checking rods to see if it has been modified/stroked.
Cooper Rods AEG521 1 5/8" journal (used to stroke)
Standard Rod 1 3/4" Journal

Nine headbolt 12G940 head is same casting as Mk2 Cooper S but different valves.
A good engine to build up.
Cheers Rob.

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82 BJ42 just completed resto
64 850 Modified(about to start rebuild)

Is it true that large journal cranks are more prone to brake if they receive a thrashing (compared to small journals) due to the extra weight they have to throw around
Then is the Lrg J crank stronger in std form or stroked

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Respect mine and I'll respect yours.

Big journal crank is heavy, and has very poor counterweighting, worse than the small journal ones. This can be improved by wedging it but it costs $$$.
This may not prevent cracking but it does reduce radial load and uneven wear on the main journals.

There is some evidence here in Oz to suggest that yes, they are more crack prone than small journal ones, but that this can be improved if you grind the journals down to 1.625" (whether you stroke, destroke, or keep stock stroke..) The weight of the damned heavy lumpy cap rods the 12G1505 cranks come with doesn't help.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.