Um, just wondering is it possible to put a small bore head (more specificly a 12G202) on a large bore engine

Normally this would give rise to the question why would you want to that? but I am thinking of trying something out and would like to be able to try it out against a 12G940 head.

If it doesn't fit, Oh well I will just have to use it on my 1100

Is there any problems such as less / more studs, or things don't line up

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Roads need more corners
A Deluxe(CG13DE), 2 Clubbies(998 and 1275) and 2 Morris 1100Ss

Nope... it will fit on but won't work, the 1275 gasket you will need to use will not cover some of the big water holes in the head.

The general rule is use the gasket that goes with the head (on small bores) but the small bore gasket won't seal the top of the 1275 block.

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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.

Is it possible to make or modify gaskets to fit? or is it a big hassle and really not worth it?

How does an 1100 perform with valves about the size of a standard 12G940?

Have you guessed what I am trying out ?

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Roads need more corners
A Deluxe(CG13DE), 2 Clubbies(998 and 1275) and 2 Morris 1100Ss

I have put 1275 valves (33/29mm) in a few 1098 heads now. But I turn the exhausts down to 27mm to avoid having to notch the block.
Note these valves are longer than 1100 ones- I put a 12mm flat washer under each valve spring, and pack the rockers up 2mm.

But it just won't flow as well as a 940 head does. Easier to notch the block and use a 940, or a 1316...

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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.