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small bore head on a large bore block?
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Author:  fuzzy-hair-man [ Wed Apr 27, 2005 6:12 pm ]
Post subject:  small bore head on a large bore block?
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. :wink:

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

Is there any problems such as less / more studs, or things don't line up :?:
Author:  drmini in aust [ Wed Apr 27, 2005 7:30 pm ]
Post subject: 
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. :shock:

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. :cry:
Author:  fuzzy-hair-man [ Wed Apr 27, 2005 9:05 pm ]
Post subject: 
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 ? :P
Author:  drmini in aust [ Wed Apr 27, 2005 10:29 pm ]
Post subject: 
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. :wink: Easier to notch the block and use a 940, or a 1316... :P
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