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PostPosted: Mon Feb 19, 2018 11:17 am 
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848cc
848cc

Joined: Tue Jun 28, 2016 1:18 pm
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Did Morris 1100 'S' 1275cc motors come standard with 9 or 11 stud holes in the block?

Ive recently taken off the head from mine and found that it has the two extra stud holes drilled and tapped ( same size and thread of other 9 studs )

From memory the extra 2 Cooper S bolt/stud where a narrower in diameter than the other 9. If this is true what size were they?


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PostPosted: Mon Feb 19, 2018 12:42 pm 
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Bimmer Twinky
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Joined: Mon Sep 06, 2004 4:36 pm
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Location: Brisbane
no, 1100"S" engines were all 9 stud,,, so someone will have "added" the 2x more, & quite commonly they simply add the 2x extras as 3/8ths like all the others, not an issue at all really

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PostPosted: Mon Feb 19, 2018 12:51 pm 
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998cc
998cc

Joined: Mon Jul 07, 2014 12:36 pm
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Location: Bentleigh, Melbourne
Isn't one of them a standard stud, the other being a small bolt near the thermostat housing? (Don't over torque the bolt like I did once!)

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67 Deluxe
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1293cc, 11:1 comp, RE 282 camshaft, 45 Weber, extractors etc
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PostPosted: Mon Feb 19, 2018 1:21 pm 
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religious status
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Location: near Baulkham Hills, NSW
Yes front one on an S is 5/16 UNC and was helicoiled. But if I add them to an 1100S block I just tap it 5/16 UNC without helicoiling. And don't drill right through or you will have to seal the thread against water leakage.

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PostPosted: Mon Feb 19, 2018 3:33 pm 
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848cc
848cc

Joined: Tue Jun 28, 2016 1:18 pm
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Thanks. The fact that someone has drilled the extra holes makes sense, as they don't line up well with the gasket or my new 11 stud cylinder head.

Had to offset mill the 2 stud holes in my new head :|


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