Hi there
I have been doing a little research about the engine in my 66 Deluxe. (It is a 1275 and I have fitted an SC12 blower). I purchased the block which was listed as a 1100S engine off ebay (in 2005). The engine number is 12H902UH which would possibly suggest a 1275LS and not an 1100S as listed. Does anyone more knowledgable know what it is from??

Cheers
Rick

P.S - Incidently, my 2nd car was a 1275LS HI Ho in 1995 and was awsome (Before it ended up on it's lid!)
(First car was a 1961 Morris 850 powerhouse)

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1310 SC 1969 Morris Deluxe - 15psi boost
1293 1968 Morris Deluxe Miglia - 45 Weber
HSV Maloo Z Series - Comp Cam - 300rwkw
Ford DF LTD - 5Ltr

I believe the 1275 LS blocks had pushrod covers at the back of the block, 1100s are solid.

Nope it's the GTs that had covers on the back (Cooper S block).
1275LS block is solid, looks like an 1100S one, but different engine prefix.

1100S (most) is 12YD/Ta/H prefix, I'm not 100% sure of the 127LS one. But 12H/902/U/H rings a bell. Mini King book agrees.

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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.

12H902UH engine is a 1275LS engine .That is what's in my 78 LS.

Regards Felix

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1967 Morris mini Deluxe
1968 Buick Riviera
1979 HZ Kingswood
1979 CM Valiant
1982 Jaguar XJ6 series 3
2002 VX HSV
2013 Mazda 6
2018 Gt Mustang

Sweet. Worth more than 1100s engine I would imagine. Yes, the block is solid (no pushrod covers).
Good to know as I would like to restore a 1275LS at some stage. Might be able to pickup a body less engine some day. (I know, he's dreaming)

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1310 SC 1969 Morris Deluxe - 15psi boost
1293 1968 Morris Deluxe Miglia - 45 Weber
HSV Maloo Z Series - Comp Cam - 300rwkw
Ford DF LTD - 5Ltr

12H902 is a 1275LS prefix.

Mine is 12H897UH whcih doesn't match any codes I have found. Both of the mechanics I have spoken to about it say it is correct and someone has mis-stamped it.

As it is an early 1275LS (July) it may be the prototype or early in the batch before they knew what the number should be. Going out on a limb there but hey who knows..

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Cheers
Alec
1275LS - July 78 - XNFAD18Y/102918

OK - Thanks everyone. Good to know. It is a strong engine and 40thou over bore. Has had 9psi of non intercooled boost thrown into it for a few years now with no dramas.

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1310 SC 1969 Morris Deluxe - 15psi boost
1293 1968 Morris Deluxe Miglia - 45 Weber
HSV Maloo Z Series - Comp Cam - 300rwkw
Ford DF LTD - 5Ltr

John Smidt's Mini King book also lists 12H897UH as a 1275LS motor.

_________________
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.

Thanks Doc.

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Cheers
Alec
1275LS - July 78 - XNFAD18Y/102918