Either I have a cracked head or the head gasket has gone. Either way, there is water on top of the cylinder but not in the oil.

So I have made the decision to rebuild the engine. this is the first time I've had anything like this done.

I am chasing suggestions for what parts to use, suggestions on what to do with the head, block, bores, cylinders, rings, gaskets, valves, rockers etc etc. I am open to doing some extra work on the engine. Will be replacing the radiator also.

At the moment He is used as a 2nd car, driven on most weekends and occasionally during the week.

I have thought about doing a brake upgrade to discs as well and using it on the track in something like the slow group that Paul Ruzic runs in his TimeAttack days.

any suggestions, ideas on which direction to head in will be welcome.

Cheers in advance.

Go to the fridge. Get a beer. Then type project small bore into google and enjoy.

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WD40'll fix it!
If it don't, use a big hammer!

Mate I'm up for a chat if you want to know the bits you'll need.
6 months ago I had the exact same problem with my 1100 so if you want tips/cost/power/obstacles send me a PM.

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1975 Clubman
1152cc, 40dcoe weber, RE83 cam, GRed head.

Has the engine been rebuilt before?
Do you know its history at all.

If you are going overbore and you have a cracked head it might be worth looking for a 1275 to start with, as machining costs will be the same either way. You may as well start with a new bigger engine.

On the other hand if there's still some life left in the bores then new rings and bearings might see it on its way.

Either way, tear it down and measure measure measure and do some more measuring, If everything is in spec then throw it back together.
Otherwise start looking at your options.

If you are looking at competition you may want to consider upgrading to ARP bolts, wedging the crank, lightening the flywheel and maybe even machine down the dished pistons a touch.
And thats just a start.

How much can you do your self and what kind of engine do you want?

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Lillee - 1969 Morris Mini K

60-100+ pistons
worked 202 head
fat carby
RE13 cam

Good for 50ish horsies at the wheels, just make sure to balance it all, and put it on a good box

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Here am I sitting in my tin can far above the Moon
Planet Earth is blue and there's nothing I can do...



“A turbo: exhaust gasses go into the turbocharger and spin it, witchcraft happens and you go faster.” - Jeremy Clarkson