Looks like I've got to get this 12G202 head I have here serviced as the exhaust valves are fairly recessed. I'm concerned that they might be so far gone that o/s valves need to be fitted. Anyone know how much extra work this would be for the machine shop to do? I have four of the right valves here anyway that are in good condition, I'm thinking I might just get them fitted regardless, and also get some extra meat taken off the deck to increase C/R, may as well.

Take it to a machining shop.

They will fit new valve seats, and lap the existing valves in accordingly.

A new angle will most likely be cut on the valve.

Hey Anto, how's things?

If you already have the smaller 1098 1.151” exhaust valves, you can fit 1.215” exhaust valves. The alternative is to machine up some hardenned seats which means you can use the original smaller valves.

I would go larger valves, when they eventually recess (won't happen for many miles if you use a Fuelstar or the like) then cut and press in the hardenned seats later on, giving you more life on the 202.

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Lillee - 1969 Morris Mini K

Yeah I might go see the machine shop. This is only a budget head anyway, although I wouldn't mind giving it a light going over with the grinder to unlock a few extra horses and torques. Whats the worst that can happen....
I have another couple of 202s here, one is already converted to unleaded, but unfortunately I'm 99% its cracked, although I guess it could be warped... we'll see.

Where do I start

Chong you are talking 1275 heads- in a 202 they are 1.000", not 1.156".
you can get 1.062" O/S ones.
Otherwise, fit inserts.

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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.

Theres a smog head sitting on my garage floor that I keep tripping over

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"Show me the Mini!"

you should put it on a bench or in a cupbaord then...

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998 smog head? I usually find the wheelie bin a good place for em, right next to all those 850 heads

I've been using one since the rebuild of my 12G940 (Mk2 'S' one) head on my car. Has anyone seen what these do in the long term? At the moment the car is fine, only mini at the dyno day not to smoke But this is obviously due to the motor being only 6000k's old.

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1964 Morris 850, 1330 Supercharged - 81.8hp atws.
1975 Leyland Mini S 1100S powered - Nice and reliable.
1977 Leyland Mini LS - Project LS-T

I run flashlube and haven't seen any reason not to. Haven't tried any of those catalysts or whatever but a mate of mine has been running one for years with no probs.
With this head of mine, the previous owner obviously did something wrong, the exhaust valves are pretty badly recessed. The engine is old enough that leaded petrol would still have been at the pumps so I dunno ??? The rings and bearings were like new and I could see hone marks on the bores.

No room...too much other K-rap Part of the problem is having six cars of various types in the yard to look after

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"Show me the Mini!"