Do you think this one is repairable?

I've had one that cracked back to the sparkplug hole repaired by spray cast iron, and then helicoiled, just kept cracking... I reckon that'd do the same

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did I tell you that I won a trophy?

Might be time to go to head heaven.n

Nah I had one like that, gave GR a look, verdict good for scrap only.
You will find it continues down the exhaust port into the water jacket.

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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.

Not mine. I just wanted to see what your thoughts were on how bad the cracks were. http://www.ebay.com.au/itm/162653003035

What about this one? Are these types of cracks ok to repair?

Yes that can usually be repaired. By those who know what they are doing.

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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.

Doc I have a mk1 S head very similar to to the one above you say can be repaired.

Talking to engine machinist and he thought could be fixed with some seats.

This sound like an ok solution that would work?

Sent from my SM-G935F using Tapatalk

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Needs to be vee'd out, preheated and welded with nickel electrode. Then machined.
The trouble with S heads is there is so little metal there, inserts are not a reliable solution.
Have a talk with Graham Russell.

I have a 940 head that had dropped a valve, smashed an old insert and damaged the inlet seat.
Graham fitted a new insert and machined the seats after we welded up the seat recess.

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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.

If it is cracked .... Throw it away.

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DID I MENTION THAT I AM THE BEST SUPPLIER FOR MINI ELECTRICAL PARTS AND REPAIRS?
"Let us remove your "SHORTS"

What is the going rate for a crack test?

I had one done, just with the magnet. COst me $70

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Doc I have a mk 1 s head that was cracked the previous owner has welded the crack and ground it back. Is this now haddit or would it be ok?

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1964 smooth roof panel van
1967 Mk 1 X-Police cooper s
1970 mini k
1975 leyland

You need to crack test it.
Alternative I have used- bolt 2 heads together with a gasket, block the heater, bypass and thermostat holes, and hook up to garden hose. This is usually 70-100psi, if cracked it will leak.

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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.

Could I please have your thoughts on this head:
S, 12G940 - 12g1805 sold to me ( a long time ago ->30yrs ) as a big valve/port head - Longman mentioned. It has extra stamps on the heater take off side, .45 25. & <1052 ????
It has small cracks between valves on cylinders 1&4 ( 2&3 none ). The push rod holes on the intakes have been sleeved and ported into - very large ports - probably too big for a road car. It was/is to go on a 1380. It is slightly pitted from surface rust. Cheaper/better to cut a new head or get this one repaired and overhauled ? Valves look in v good condition, haven't sized the stems.
A few pics.

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1970 Mk2 Cooper S under restoration